IPC Cannot Connect on HPE Data Protector A.09.08
I guess that you receive this error for an specific client, please check DNS resolution or hosts entires in reference to this client, seems to be wrong.
IPC Cannot Connect, system error:  No route to host
The client is simply not reachable from the Cell Manager Backup Session Manager (BSM). I recommend to perform basic connecitivity tests (ping Hostname, telnet Hostname 5555) from both ends and resolve any possible blocking conditions to make this work.
Please use the Like button below, if you find this post useful.