Error connecting to Salesforce: UNSUPPORTED

Error connecting to Salesforce: UNSUPPORTED_CLIENT (206581)

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Title

Error connecting to Salesforce: UNSUPPORTED_CLIENT
Description

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.
Cause

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.
Resolution
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.