Author profile
Mihailo Ivanjac
Mihailo Ivanjac is the founder and editor of TroubleByte and SajberSfera. He writes and source-reviews practical troubleshooting guides covering Windows, software, hardware, networking, mobile platforms, gaming and self-hosted infrastructure.
Founder, editor and source reviewerThis profile describes work performed on TroubleByte. It does not claim vendor certification, employment by cited companies, or hands-on testing unless an individual problem record explicitly documents that test.
Current records
Problems written and source-reviewed
VERIFIED
Cloudflare Error 520: Web server returned an unknown errorCloudflare 520 is generated when the origin sends an empty, unknown or unexpected response. Common causes include origin crashes, malformed or oversized headers, firewall/security blocks, incorrect HTTP/2-to-origin behavior, or an early connection close. The useful evidence is the affected URL, Ray ID and origin logs.
NetworkingSep 8
VERIFIEDCloudflare Error 523: Origin is unreachableCloudflare 523 is a routing/reachability problem: Cloudflare cannot contact the configured origin because the origin IP is wrong or the network path has no usable route. It is distinct from 521 refusal and 522 timeout, so the fastest checks are DNS origin address and routing evidence rather than application code.
NetworkingSep 8
VERIFIEDCloudflare Error 524: A timeout occurredCloudflare 524 means the TCP connection to the origin succeeded, but the origin did not return an HTTP response within the proxy read timeout (125 seconds by default) or did not complete a write in time. That makes slow application work, long database queries and resource saturation more relevant than firewall reachability.
NetworkingSep 8
VERIFIEDDiscord camera not workingDiscord video can fail because the wrong camera is selected, Windows or browser permission is denied, another application has the camera open, or the camera itself is unavailable to the operating system. Network changes are usually the wrong first layer when the local preview is already black.
GamingSep 8
VERIFIEDCan’t hear anyone on DiscordDiscord can show users speaking while you hear nothing because the client is deafened, the wrong output device is selected, per-user/channel volume is low, or the Windows playback device differs from Discord. The fastest path proves output outside Discord before deeper changes.
GamingSep 8
VERIFIEDDiscord screen share shows a black screenA Discord stream can show a black or blank image when capture of a particular application fails, hardware acceleration conflicts with the video path, the client is outdated, or OS capture permissions are wrong. If voice and the stream session work, DNS and router changes are usually the wrong layer.
GamingSep 8
VERIFIEDDiscord update failed or update loop on WindowsDiscord update loops can result from a stuck process, damaged local installation files, connectivity or proxy/VPN interference, or an unsupported Windows environment. Discord’s own troubleshooting places full process shutdown and clean installation state ahead of random updater renames or registry edits.
GamingSep 8
VERIFIEDDocker container DNS resolution not workingDocker containers normally inherit or proxy DNS based on the network they use. Default-bridge containers receive resolver settings derived from the host, while custom networks use Docker’s embedded DNS. Loopback resolvers such as 127.0.0.1 on the host are a common mismatch because that address means the container itself inside its network namespace.
ServersSep 8
VERIFIEDDocker: no space left on deviceDocker can consume substantial storage through images, stopped containers, build cache and volumes. A no-space error may also come from the host filesystem or inode exhaustion. Docker provides docker system df to measure daemon usage and conservative prune commands that only remove categories you explicitly choose.
ServersSep 8
VERIFIEDAirDrop not working on iPhoneAirDrop discovery depends on nearby compatible Apple devices, Wi-Fi and Bluetooth, the recipient’s receiving setting and short-range connectivity. Personal Hotspot or restrictive receiving settings can prevent discovery, so those checks are more useful than changing router DNS or cellular settings.
PhonesSep 8
VERIFIEDBluetooth accessory not connecting to iPhoneBluetooth pairing failures often come from the accessory not being in discovery mode, low power, stale pairing data, another device holding the connection, or app-level Bluetooth permission. Apple recommends accessory power/proximity and re-pairing before treating the iPhone radio as failed.
PhonesSep 8
VERIFIEDiPhone camera not working or showing black screenA black or unreliable iPhone camera can be caused by an accessory blocking the lens, a temporary software state, or a problem isolated to one camera module. Apple recommends removing cases/accessories, testing the camera and flashlight, restarting and updating iOS before service.
PhonesSep 8
VERIFIEDFace ID not working on iPhoneFace ID depends on the TrueDepth camera seeing the user correctly and on the requested Face ID feature being enabled. Apple recommends checking software, settings, camera obstruction and device position before resetting Face ID; inability to set it up with a nonworking camera can require service.
PhonesSep 8
VERIFIEDiPhone shows SOS, No Service or SearchingSOS, No Service and Searching indicate the iPhone is not connected to its normal cellular network. The cause can be temporary radio state, a carrier outage/account issue, SIM/eSIM provisioning, carrier settings, roaming configuration or device hardware; carrier checks belong early because only the carrier can see account provisioning.
PhonesSep 8
VERIFIEDiPhone notifications not showingMissing iPhone alerts can be caused by per-app notification settings, sound/alert style, Focus or silent state, conversation filters, or a paired Apple Watch receiving the alert instead. The useful first step is to isolate one app and confirm how that app is allowed to notify.
PhonesSep 8
VERIFIEDiPhone Personal Hotspot not workingPersonal Hotspot depends on cellular service, carrier/plan support, the hotspot toggle, Wi-Fi/Bluetooth state and compatibility with the client device. Apple recommends reconnecting after each simple step and leaves Reset Network Settings as a later action because it also clears saved network and VPN/APN settings.
PhonesSep 8
VERIFIEDiPhone screen not responding to touchIntermittent or missing touch response can come from debris or water on the display, a case or screen protector, a connected accessory or charger, or an underlying display/touch fault. Apple recommends removing these variables before service.
PhonesSep 8
VERIFIEDiPhone storage almost fullWhen iPhone storage is almost full, iOS shows storage use by category and can recommend safe ways to reclaim space. Offloading unused apps preserves their documents and data, while deleting an app removes its related data; large local photos, downloads and messages can also dominate device storage.
PhonesSep 8
VERIFIEDGoogle Pixel camera not workingPixel Camera problems can come from lens obstruction, temporary app state, an outdated Camera/Android build, another downloaded app, or hardware. Google recommends checking after each step and uses Safe Mode as an isolation test: if Camera works there, a downloaded app is likely interfering.
PhonesSep 8
VERIFIEDPixel fingerprint sensor not workingFingerprint Unlock behavior varies by Pixel model and sensor type, but Google recommends current Android software, a clean sensor/display, correct finger placement and re-enrollment before hardware conclusions. Some security states also intentionally require the backup PIN instead of fingerprint.
PhonesSep 8
VERIFIEDPixel phone freezes or becomes unresponsiveA Pixel that freezes, stops responding or stays stuck with the screen on can be caused by temporary software state, low storage, outdated software or a downloaded app. Google recommends restart, updates, storage checks and Safe Mode before a factory reset.
PhonesSep 8
VERIFIEDPixel hotspot not workingPixel hotspot failures can come from mobile-data service, carrier plan restrictions, Data Saver, hotspot configuration or model-specific Wi-Fi/hotspot behavior. Google recommends checking hotspot state and carrier support before deeper resets.
PhonesSep 8
VERIFIEDMobile data not working on Google PixelA Pixel can lose mobile data because the data toggle or SIM line is off, the carrier has an outage or provisioning issue, signal is obstructed, roaming is required, or local network settings are unhealthy. Google puts carrier and line state alongside device troubleshooting because the phone cannot fix an account-side outage.
PhonesSep 8
VERIFIEDPixel phone getting too hotPixel phones can feel warm during gaming, video, navigation, hotspot use, large transfers, setup or charging. Google describes thermal states and notes that the phone may reduce performance, charging, camera or network features to protect itself as temperature rises.
PhonesSep 8
VERIFIEDPixel touchscreen not respondingPixel touchscreen sensitivity and response can be affected by dirt, moisture, gloves, cases, screen protectors or a software/app problem. Google recommends physical-screen checks first and offers touch diagnostics on supported Pixel models before destructive reset.
PhonesSep 8
VERIFIEDGoogle Pixel phone will not chargeA Pixel charging failure can come from the cable, power adapter, outlet, USB-C port, case/accessory interference, temperature, a deeply discharged battery or the phone itself. Google’s troubleshooting starts by proving the external power path before treating the battery or charging hardware as failed.
PhonesSep 8
VERIFIEDSteam Cloud not syncing game savesSteam Cloud synchronization can fail because Cloud is disabled globally or per game, the title does not sync the file you expect, a conflict exists between local and remote data, or the client cannot complete a sync. Because save loss may be irreversible, preserve the newest local data before resolving conflicts.
GamingSep 8
VERIFIEDEthernet not working in Windows 11A wired connection can fail because of the cable, router port, ISP path, disabled or unhealthy Ethernet adapter, bad IP configuration, VPN/proxy software, or a driver problem. The useful first split is whether another device can use the same router and whether Windows sees the Ethernet link at all.
WindowsSep 8
VERIFIEDExternal monitor not detected in Windows 11An external display can disappear because of projection mode, a bad cable or adapter, dock conflicts, the monitor input, or display-driver state. The efficient path proves the physical connection first, then checks Windows display detection and only later changes drivers.
WindowsSep 8
VERIFIEDFile Explorer won’t open in Windows 11When File Explorer refuses to open or start, Microsoft recommends beginning with Windows Update and a normal restart before escalating to broader system repair. The failure can be transient, update-related, or tied to damaged system components rather than one folder or drive.
WindowsSep 8
VERIFIEDKeyboard not working in Windows 11A keyboard can stop responding because of a loose USB connection, a dead wireless battery, a hub problem, a damaged port, a missing driver, or the keyboard itself. Testing power and a direct connection first prevents unnecessary driver changes when the fault is physical.
WindowsSep 8
VERIFIEDMicrosoft Store not opening in Windows 11When Microsoft Store will not launch, a damaged Store cache, pending Windows update, incorrect time or region, or a broken app package can be involved. Microsoft documents a low-risk sequence that starts with wsreset and system state before moving to app repair or reset.
WindowsSep 8
VERIFIEDOneDrive not syncing in Windows 11OneDrive sync can stop because the client is not running, Microsoft storage is full, the account is paused or signed out, a file cannot sync, or the local sync engine is unhealthy. Reading the OneDrive status icon and exact file error first is safer than resetting the client immediately.
WindowsSep 8
VERIFIEDWindows PC charging slowly while plugged inA Windows laptop can charge slowly or even discharge while plugged in when the charger, cable or selected USB-C port cannot provide the power the device requires. Microsoft recommends using the charger/cable designed for the PC and confirming the correct charging port.
WindowsSep 8
VERIFIEDScreen flickering in Windows 11Windows screen flicker is commonly associated with a display-driver problem or an incompatible application. Microsoft recommends using whether Task Manager flickers as a quick discriminator before choosing a driver or app-focused repair path.
WindowsSep 8
VERIFIEDWindows Search indexing not finding filesWindows Search relies on an index for fast file and content lookup. Missing results can reflect excluded locations, Classic versus Enhanced indexing scope, an index still being built, or a problem limited to one application rather than a broken Windows search service.
WindowsSep 8
VERIFIEDTouchpad not working in Windows 11A laptop touchpad may stop responding because it was disabled, a driver is missing or outdated, or the device is not being detected correctly. Microsoft’s current troubleshooting focuses on Windows Update and Device Manager driver recovery before assuming a hardware fault.
WindowsSep 8
VERIFIEDWindows Update error 0x800F081FIn Windows Update, Microsoft groups 0x800F081F with missing or corrupted system files and incomplete update content. In DISM or optional-feature contexts the same code can also mean that required source files could not be found, so the failing subsystem matters.
WindowsSep 8
VERIFIEDWindows Update stuck downloading or installingA Windows update can appear stuck because the device lacks storage, the connection is unstable, another process is blocking installation, or update components are incomplete. The safest path is to verify time, connectivity and free space, run the Windows Update troubleshooter, restart, and only then consider deeper repair.
WindowsSep 8
VERIFIEDUSB-C device not working in Windows 11USB-C is a connector, not one guaranteed feature set: charging, display output, Thunderbolt/USB4 and data can depend on the PC port, cable, dock and device. Microsoft recommends matching capabilities and testing a direct connection before deeper driver or hardware conclusions.
WindowsSep 8
VERIFIEDCloudflare 502 Bad Gateway: origin or edge?Cloudflare says 502 and 504 errors most commonly originate at the web server, but Cloudflare can also generate them. The first diagnostic task is identifying whether the origin or Cloudflare produced the response.
NetworkingSep 7
VERIFIEDCloudflare Error 521: Web server is downCloudflare defines Error 521 as the origin web server refusing connections from Cloudflare. Common causes include an offline origin application or security rules blocking Cloudflare IP ranges.
NetworkingSep 7
VERIFIEDCloudflare Error 522: Connection timed outCloudflare defines Error 522 as a timeout while contacting the origin. It can occur before the TCP connection is established or after connection when the origin does not acknowledge the request in time.
NetworkingSep 7
VERIFIEDCloudflare Error 525: SSL handshake failedCloudflare Error 525 is an origin-side TLS handshake failure while Full or Full (Strict) encryption is in use. Confirm the origin is actually serving HTTPS on the expected port and hostname, then inspect SNI/cipher/certificate configuration instead of changing browser settings.
NetworkingSep 7
VERIFIEDCloudflare Error 526: invalid SSL certificateCloudflare Error 526 is a certificate-validation failure at the origin under Full (Strict). Check the origin certificate’s expiry, hostname coverage, chain and trust source, and confirm the origin serves the correct certificate for the requested hostname.
NetworkingSep 7
VERIFIEDERR_TOO_MANY_REDIRECTS on CloudflareCloudflare says redirect loops commonly come from a conflict between SSL/TLS encryption mode, edge certificate options or redirect rules and the redirects already configured at the origin.
NetworkingSep 7
VERIFIEDDiscord stuck on RTC Connecting or No RouteDiscord groups RTC Connecting, No Route, ICE Checking and Connecting as voice connection failures that can be caused by local network, firewall or VPN interference, or by service-side availability problems.
GamingSep 7
VERIFIEDDiscord screen share has no audioWhen Discord screen sharing shows video but viewers hear no shared audio, separate capture permission/source problems from general voice or network trouble. Confirm the correct app/window is being shared, update Discord/OS, check permissions and test Discord capture settings.
GamingSep 7
VERIFIEDCannot connect to the Docker daemonDocker documents two primary causes for “Cannot connect to the Docker daemon”: the daemon is not running, or the client is pointed at another unreachable daemon. On Linux, local Unix-socket permissions can also prevent a non-root user from connecting even when dockerd is healthy.
ServersSep 7
VERIFIEDDocker published port is not reachableDocker containers are isolated by default, so a service is not reachable from outside the host until the correct container port is published with `-p` or `--publish`; a Dockerfile `EXPOSE` instruction alone does not create a host mapping. A localhost-only host bind can also intentionally prevent remote access.
ServersSep 7
VERIFIEDiPhone can’t connect to Wi-FiApple’s current Wi-Fi flow separates a single-network problem from an iPhone-wide problem. Check Wi-Fi and Airplane Mode, test another device and another network, remove problematic VPN/security software, and reserve Reset Network Settings for later because it removes saved network configuration.
PhonesSep 7
VERIFIEDNo sound from iPhone speakerApple’s speaker troubleshooting starts with Silent mode and Focus, then checks cases, blocked or dirty speaker/receiver openings and the Ringtone and Alerts slider. If there is still no sound or the speaker control is dimmed, hardware service may be required.
PhonesSep 7
VERIFIEDiPhone stuck on the Apple logo or progress barApple says an iPhone can remain on the Apple logo and progress bar during restore or migration. If the progress bar has not moved for at least one hour, the documented recovery path is recovery mode and an Update attempt before a destructive Restore.
PhonesSep 7
VERIFIEDiPhone temperature warning or overheatingApple documents that iPhone behavior changes when the device is outside its normal temperature range. Charging, performance, radios, camera features or the display may be limited until the phone cools, and a temperature warning should be treated as a stop-and-cool condition.
PhonesSep 7
VERIFIEDiPhone won’t turn on or shows a black screenApple’s current recovery path for an iPhone that will not turn on begins with the model-appropriate force restart. If the screen remains black, charge the phone and try again; a device that still does not start after the supported steps may require service.
PhonesSep 7
VERIFIEDApp keeps crashing or won’t open on PixelGoogle’s Pixel app troubleshooting uses a staged flow: restart and update first, then force stop and app storage steps, with Safe Mode useful when a downloaded app may be interfering. Keeping the scope to one app versus many apps avoids unnecessary phone-wide resets.
PhonesSep 7
VERIFIEDPixel battery drains too fastGoogle notes that Pixel battery use can temporarily increase after setup, factory reset or a software update while optimization completes. Battery diagnostics and per-app usage should be checked before disabling core services or assuming the battery hardware has failed.
PhonesSep 7
VERIFIEDPixel Bluetooth won’t connect or pairGoogle’s current Pixel Bluetooth guidance starts with Bluetooth diagnostics on Pixel 6 and later, then basic radio, pairing and restart checks. If one accessory still fails, forget/re-pair it and isolate whether the failure follows the phone or the accessory.
PhonesSep 7
VERIFIEDSteam “App Already Running” errorSteam’s App Already Running error often follows an improper shutdown, silent crash or hung process, and it can also occur when the game is running under another OS user. Clear the real process first, then verify files if the launch state repeatedly becomes stuck.
GamingSep 7
VERIFIEDSteam game won’t launch after Preparing to LaunchSteam notes that a game which appears not to launch may actually crash immediately. Verify the game files, update the operating system and relevant drivers, check requirements and test without nonessential conflicting software before a full reinstall.
GamingSep 7
VERIFIEDSteam “Missing Executable” errorSteam’s Missing Executable error means a required game file is absent or being blocked. Antivirus quarantine is a documented common cause; the next safe step is to verify the game files so Steam can restore a corrupted or failed download.
GamingSep 7
VERIFIEDNo audio output device is installed in Windows 11Windows can show “No audio output device is installed” when the audio device is disabled, hidden, missing a compatible driver or no longer being detected after an update or driver change.
WindowsSep 7
VERIFIEDBlack screen after login in Windows 11A Windows 11 black or blank screen after login can be a display-output problem, a stalled Windows process, a graphics-driver issue or a recent update problem. Whether you still see the cursor or can open the security screen determines the safest next branch.
WindowsSep 7
VERIFIEDCamera not working in Windows 11A Windows 11 camera failure can come from privacy permissions, a physical shutter or hotkey, another app, security software, USB detection or the camera driver. The fastest path is to prove whether Windows itself can use the camera before changing one conferencing app.
WindowsSep 7
VERIFIEDWindows Hello face, fingerprint or PIN not workingWindows Hello issues can affect face recognition, fingerprint recognition or the PIN used as a fallback. The safest approach is to identify which sign-in method is failing, use another valid sign-in method when available, and only reset or re-enroll the affected Hello method.
WindowsSep 7
VERIFIEDMicrophone not working in Windows 11When a microphone fails in Windows 11, first determine whether Windows can record it at all. Privacy access, the selected input device, mute state, Bluetooth pairing and driver detection should be checked before changing settings inside Discord, Teams or another app.
WindowsSep 7
VERIFIEDPrinter shows Offline in Windows 11A printer marked Offline may simply be unreachable, paused, on another Wi-Fi network, stuck behind queued jobs or using the wrong Windows printer state. Start with power and connectivity, then queue/default status, before removing and reinstalling the printer.
WindowsSep 7
VERIFIEDWHEA_UNCORRECTABLE_ERROR in Windows 11Microsoft describes WHEA_UNCORRECTABLE_ERROR as a stop/blue-screen error that can occur when Windows encounters a hardware error. The safe first path is updates/drivers and recent-change recovery before hardware diagnosis.
WindowsSep 7
VERIFIEDWi-Fi connected but no internet in Windows 11“Connected, no internet” means the Wi-Fi link may be established while internet reachability still fails. Testing another device on the same network separates router or ISP trouble from a Windows-only problem before you flush DNS, renew IP settings or reset networking.
WindowsSep 7
VERIFIEDWi-Fi option missing in Windows 11When the Wi-Fi option disappears from Windows 11, Microsoft recommends checking the physical wireless switch, adapter state, WLAN service and network adapter driver before broader network reset steps.
WindowsSep 7
VERIFIEDDiscord microphone not working on Windows 11When Discord cannot hear a microphone, the most common first checks are the selected input device, mute/input mode, Windows microphone permissions, and Discord’s own Voice & Video settings.
GamingSep 6
VERIFIEDDNS_PROBE_FINISHED_NXDOMAIN: what it means and what to checkDNS_PROBE_FINISHED_NXDOMAIN means the DNS lookup completed with NXDOMAIN: the resolver determined that the requested name does not exist. For site owners, missing or incorrect DNS records are a primary place to check.
NetworkingSep 6
VERIFIEDDocker container keeps restarting in a loopA Docker container that repeatedly returns to a running/restarting state can be caused by its main process exiting while a restart policy relaunches it. First inspect the container state, restart count and policy; also note that Docker only activates a restart policy after the container has started successfully for at least 10 seconds.
ServersSep 6
VERIFIEDiPhone not charging or charging slowlyAn iPhone that will not charge can be caused by a damaged cable or adapter, a poor power connection, debris in the charging port, temperature limits, or a fault that requires service.
PhonesSep 6
VERIFIEDNVIDIA driver installation failed on Windows 11NVIDIA driver or NVIDIA App installation can fail because Windows is in an inconsistent state, a previous NVIDIA package is still present, or NVIDIA processes and services are holding files the installer needs.
WindowsSep 6
VERIFIEDGoogle Pixel Wi-Fi keeps disconnectingIntermittent Pixel Wi-Fi can come from the phone, the specific Wi-Fi network, or the upstream internet connection. Google’s troubleshooting flow starts by isolating which of those three layers is actually failing.
PhonesSep 6
VERIFIEDProxmox VM has no network or internet accessA Proxmox VE guest normally reaches the physical network through a Linux bridge such as vmbr0. If the VM has no network, verify the VM NIC, bridge attachment, host bridge uplink and guest IP configuration in that order.
ServersSep 6
VERIFIEDSteam download stuck or not progressingSteam downloads can stall because of a corrupted download cache or a content-server/region problem. Valve documents clearing the download cache and checking the download region as standard recovery steps.
GamingSep 6
VERIFIEDBluetooth disappeared in Windows 11When the Bluetooth toggle or icon disappears, Windows may not be detecting or enabling the adapter. Microsoft lists driver compatibility, stopped services, hardware problems, settings and recent updates among the common causes.
WindowsSep 6
VERIFIEDWindows Update error 0x80070005: Access DeniedFor Windows Update, Microsoft describes 0x80070005 as an Access Denied error or a sign that the account does not have sufficient permission to install the update.
WindowsSep 6
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