Fix: Cannot Connect to Server Try Connecting Again in a Few Minutes – Citrix
Citrix clients may receive the following message on their thin client terminals when trying to login and make a connection through Citrix Receiver.
Cannot connect to server. Try connecting again in a few minutes.
Check the system log for time-out related messages, such as Failure – Probe Timed Out or DOWN; Last response - failure. These messages might be related to your company domain controllers and Citrix Storefront servers. Ensure your network did not suffer connections issues to the correlated times.
In addition, refer to the official Citrix article documenting this error here.