Radarr: "The request was aborted: Could not create SSL/TLS secure channel." connecting to indexer

[MarkekJankowski]

I am getting an error: "The request was aborted: Could not create SSL/TLS secure channel." when trying to test connection to an indexer.... Indexer supports both TLS 1.1 and 1.2 (Running Windows version 7)

[MarkekJankowski]

Disregard.... On Windows Radarr is trying to connect to Indexer using TLS 1.1... and Indexer was just updated to use TLS 1.2... Thats why I was getting that error...

Setting a default for >NET in registry fixes the issue...
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft.NETFramework\v4.0.30319]

"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework\v4.0.30319]

"SchUseStrongCrypto"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft.NETFramework\v2.0.50727]

"SystemDefaultTlsVersions"=dword:00000001

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft.NETFramework\v2.0.50727]

"SystemDefaultTlsVersions"=dword:00000001

[fryfrog]

Thanks for figuring out and solving it, but I wonder why more haven't run into it? More and more sites are enforcing higher versions of TLS. :/

[DanielRTRD]

This fixed the issue for me too! Running Windows 10. Maybe create a "common problems"-topic in the wiki?

[traintrax]

I am so glad I stumbled across this. It fixed the same issue for me on Windows 2012R2 server. @MarkekJankowski thank you.