Error connecting to Salesforce: UNSUPPORTED_CLIENT (206581)

Error connecting to Salesforce: UNSUPPORTED_CLIENT

When connecting to Salesforce, the following error is displayed:

UNSUPPORTED_CLIENT: TLS 1.0 has been disabled in this organization. Please use TLS 1.1 or higher when connecting to Salesforce using https.

Salesforce is rolling out an update where they are no longer supporting TLS 1.0 connections over HTTPS. Quick Connect uses .Net 4.0 which does use TLS 1.0 by default for connecting over HTTPS.

WORKAROUND

Make sure to make a backup of the Registry before making any changes.

Use the following steps to enable strong encryption for all .Net 4.0 applications.

1. Open the Registry Editor.
2. Navigate to the following path:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\v4.0.30319
   
3. Add or edit the following DWORD entry:
   Name SchUseStrongCrypto
   Value 1
   
4. Restart the Quick Connect Service.