Security token service is not available- SharePoint 2010

Security token plays an important role with respect to authentication purpose, if this stops functioning then you will start getting so many tickets regarding access as well as critical tickets which are dependent on the same as few other services are also dependent on this service i.e. security token.

Here is the Microsoft link which talks about in details on security token:

http://technet.microsoft.com/en-us/library/ee806864(v=office.14).aspx

While doing the sanity check across all front ends, we have noticed the security token service exception in the event viewer logs with respect to one of the server.

Here are the details:

Error message: Security token service is not available.

Checked the IIS status and found all the application pools and websites were in stopped status.

Started all the SharePoint entities which were in stopped status.

Checked the rule again and it was not there in the HA list anymore.

Issue resolved, we are good now. Thank you.

Few IMP points which are essential while troubleshooting this issue:

In our case, the security token service was working initially without any issues and the farm was already built properly. But in your case, if it’s a newly built farm then it might be a hotfix issue as per this Microsoft article:

http://support.microsoft.com/kb/2493524

http://technet.microsoft.com/en-us/library/hh564135(v=office.14).aspx

If you have any queries regarding the above mentioned information then please let me know, I would be more than happy to help you as well as resolves your issues.

Also-if you have a different resolution regarding the same issue then request you to share the same so that it would be useful to other as well. Thank you.