SharePoint error - An exception occurred when trying to issue security token: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms..

Problem

Analysis

• Connecting to any SharePoint site throws error in browser - An unexpected error has occurred.
• Connecting to SharePoint FARM Central Admin throws same error - An unexpected error has occurred.
• FARM is up and running.
• SQL Server and Databases are up and running.
• No new changes, no recent updates or deployments.
• Interesting error found in logs (Event Viewer and SharePoint ULS Logs)

An exception occurred when trying to issue security token: This implementation is not part of the Windows Platform FIPS validated cryptographic algorithms..

Fix / Solution

1. Open Local Group Policy Editor (gpedit.msc).
2. Click Computer Configuration.
3. Click Windows Settings.
4. Click Security Settings.
5. Click Local Policies
6. Click Security Options.
7. Scroll to 'System cryptography: Use FIPS compliant algorithms for encryption, hashing and signing' (this should not be enabled).
8. Ensure the policy is DISABLED. Take help from your system administrator if you are not authorized to change this.
9. Repeat on all Windows servers in your FARM which are affected.
10. Perform IIS RESET.
11. Verify the setting and ensure the policy is disabled.

This setting may be enabled and applied by your network team for various reasons, or by mistake. But this should be set to disabled state.
It is recommended to test this out in Development or UAT environment first and only then perform the steps on Production SharePoint servers.

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