Thank you very much for the quick turn around.

On Wed, 2017-01-18 at 20:33 -0500, Koby, Bradley wrote:
> pbs_server has been restarted.   There is an open support case with
> the vendor on this issue as it has occurred once before over the
> weekend.
> 
> 
> Brad
> 
> On Wed, Jan 18, 2017 at 8:23 PM, Dhananjai M. Rao <[log in to unmask]>
> wrote:
>         Hello,
>         
>         The cluster was working fine until about 6:30 PM (EST) today
>         (Wed, Jan
>         18). However, now the PBS queue seems to have shutdown again.
>         When I run
>         "qsub -I", I get the error(s) shown below. I will be thankful
>         if you
>         could troubleshoot this issue.
>         
>         [raodm@mualhpcp01 parallel]$ date
>         Wed Jan 18 20:23:04 EST 2017
>         [raodm@mualhpcp01 parallel]$ qsub -I
>         
>         Unable to communicate with mualhpcp01.local(192.168.252.12)
>         Cannot connect to specified server host 'mualhpcp01.local'.
>         qsub: cannot connect to server mualhpcp01.local (errno=111)
>         Connection
>         refused
>         [raodm@mualhpcp01 parallel]$ qstat
>         
>         Unable to communicate with mualhpcp01.local(192.168.252.12)
>         Cannot connect to specified server host 'mualhpcp01.local'.
>         
>         Unable to communicate with mualhpcp01.local(192.168.252.12)
>         Cannot connect to specified server host 'mualhpcp01.local'.
>         
>         Unable to communicate with mualhpcp01.local(192.168.252.12)
>         Cannot connect to specified server host 'mualhpcp01.local'.
>         qstat: cannot connect to server mualhpcp01.local (errno=111)
>         Connection
>         refused
>         qstat: Error (111 - Connection refused)
>         [raodm@mualhpcp01 parallel]$
>         
>         
>         
>         
> 
>