I work with @sijisaula and am assisting with this as well.
I followed your instructions and did not receive the standard telnet response of “Escape character is ‘^]’.” Instead, I got the following (leaving out the actual address):
Trying [$PBS_O_HOST address] …
telnet: connect to address [$PBS_O_HOST address]: No route to host
However, the same $PBS_O_HOST can be pinged successfully from node0115 (and other compute nodes).
Does this narrow it down at all?