Sharepoint 2013 and SPSeceurityTokenService not available. The Security Token Service is not issuing tokens. "The service could be malfunctioning or in a bad state"

SharePoint 2013 security token. On our SharePoint Web front end we are getting a notification "The Security Token Services is not available " for the SPSecurityTokenService  service.
The Security Token Service is not issuing tokens. "The service could be malfunctioning or in a bad state"
it does not appear to be impacting anything. What is this and what do we need to do to resolve it?
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Walter CurtisSharePoint AEDCommented:
One of the first troubleshooting steps or corrective is to restart the STS application pool. Here is a good article that describes how to do this:

I have used this procedure in the past and it works good. Not every time, but most of the time.

Here is another link that may be helpful:

Hope that helps...

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