“Invalid provider type specified” CryptographicException when trying to load private key of certificate

Question

I\'m trying to read the private key of a certificate which has been shared with me by a third-party service provider, so I can use it to encrypt some XML before sending it t

Answer 1

For a .net 4.8 WCF service I was getting this error because i hadn't (also) set the httpRuntime version.

Without the httpRuntime set i was getting the error whenever a secured .net tcp binding was present.

I had already setup the required permissions in mmc.exe -> add snap-in -> certificates -> personal -> all tasks -> manage private keys -> add [computer name]\IIS_IUSRS (all my application pools are ApplicationPoolIdentity [default] - which is covered by IIS_IUSRS)