Unknown SQL Exception 0 occurred error on IIS server

Hello,

I searched all over and could not find an answer or a fix to these errors I am getting on one of our IIS servers

I am getting Event ID 5586 for SharePoint Foundation error for Task Category Database only on one of our IIS Servers.

The error details are:

Unknown SQL Exception 0 occurred. Additional error information from SQL Server is included below.

The target principal name is incorrect.  Cannot generate SSPI context.

We have an IIS web farm, which include iis1 and iis2. SQL is on it's own server and Sharepoint Central Admin is on another server

We are getting these errors every few seconds but only on the one IIS server.

Any ideas would be great.

Thanks,