MetaFrame Presentation Server has entered the grace period. You have hour(s) remaining before this server stops accepting connections from client devices.

Reading Time: < 1 minute

All is well with your citrix farm and then you receive the below log within your event log.  

Error: MetaFrame Presentation Server has entered the grace period. You have xx hour(s) remaining before this server stops accepting connections from client devices.

This means that your Citrix server can no longer communicate with the license server but will still allow users to connect until the grace period ends.

Check that the servers are up and running and the required services have not stopped. Carry out your basic checks such as pings.

Note that the grace period his held in memory on the Citrix server(s) so if the Citrix server(s) are rebooted, the cached license key may clear stopping users from connecting.

A fix which i carried out recently was to restart the Citrix licensing services on the license server. After a couple of minutes you should see events appear within the application/system log indicating that the servers have left the grace period and are now able to talk to the license server.

Carry out further tests to make sure users can login.

Citrix Ticket Logon attempted on expired ticket

Reading Time: < 1 minute

The above alert usually occurs when a user (using NFuse) right clicks a citrix application and saves the ica file. By default the ticket will expire after 200 seconds. To replicate the above error, save the ica file to your desktop and launch after 5 minutes, you should receive the same error as above within your server event log.