AnyDesk’s network infrastructure uses SHA-256 certificates. Out-of-the-box Windows XP installations only recognize older SHA-1 certificates, resulting in dropped connections. Fix 1: Downgrade to AnyDesk Legacy Version 6.1.0

AnyDesk will not run on SP1 or SP2 due to missing system files. Ensure SP3 is installed.

These are distributed as standalone .exe files on forums, file‑sharing sites, or GitHub repositories with names like AnyDesk_XP_Fixed.exe , AnyDesk_7.0.14_XP_Hack.7z , etc.

If the AnyDesk central registration servers continue to reject your legacy client ID, you can bypass the AnyDesk servers completely by using direct IP addressing. Go to AnyDesk Settings > Security.