doesn't connect cluster

[Soroushmehr1]

I created a pbs cluster using the code in the simple_hpc_pbs folder and it was working properly. After log out the headnode (using exit) I could not connect it again (by using "azhpc-connect -u hpcuser headnode"). It shows the below message and after a couple of seconds goes back to the command line without showing any error.

[2024-04-10 13:39:12] logging directly into headnode6bbef4.eastus.cloudapp.azure.com

In the Azure portal, it shows the headnode is running and I can connect the headnode using "Serial console". I also did "az login" again but didn't help.
This issue has also happened (not always) even just after successfully creating a cluster (i.e. no error when I ran azhc-build but "azhpc-connect -u hpcuser headnode" cannot connect to the headnode).
How to resolve this issue?