Troubleshooting
Why Your Site Says Not Secure—and How to Fix It
Updated Sep 3, 2026
Fix
Diagnose the failure,
then fix it safely
Search errors, logs, and symptoms to get proven solutions. Follow step-by-step fixes, understand the cause, and verify with confidence.
Avoid pasting passwords, access tokens, private keys, or other secrets.
Start here — Get unstuck fast
I have an error messageSearch exact errors · 85My device is not workingHardware and driver issues · 5System is slow or laggingCPU, memory and I/O · 5Network / Wi-Fi issuesConnectivity problems · 6App / Service is crashingLogs and runtime failures · 2Kernel / Boot problemsBootloops, panic and init · 5
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How every Fix works
Identify the issue
Start with the exact error, log, or observable symptom.
Understand the cause
Connect evidence to known root causes before changing the system.
Apply the safest fix
Prefer reversible steps and clearly label destructive commands.
Verify and confirm
Run an explicit check and compare the expected result.
Existing library
Continue exploring
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Fix Android AAPT unbound prefix XML compilation errors: add missing xmlns:android or xmlns:app namespace declarations to root layout elements.
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Read guide Fix BRLTTY Disconnecting USB Serial COM Ports on Ubuntu
Stop BRLTTY daemon from claiming CH340 / FTDI USB serial COM ports in Linux: disable udev rules, mask brltty.service, and restore ttyUSB access.
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Read guide How to Fix GRUB Rescue Prompt (`grub>`) in Linux
Recover your Linux system from the grub rescue prompt: locate root partitions (ls, set root, prefix), load normal module, insmod, and update-grub.
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Read guide How to Use GDB to Debug C Functions Across Multiple Files
Learn how to debug multi-file C applications using GDB: master gcc -g debug symbols, breakpoints by filename (break file.c:line), and stack frames.
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Read guide How to Fix "undefined reference to _exit" in ARM GCC Linker
Fix the undefined reference to _exit error in bare-metal ARM GCC builds: learn specs flags (--specs=nosys.specs, rdimon.specs) and custom syscalls.
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