sys_copy and scp -rpb error captured on pbs_mom logs

I was encountering an interesting scp error on my log file regarding pbs_mom

.......pbs_mom: LOG_ERROR::sys_copy, 
command '/usr/bin/scp -rpB  2014.Head-Node.OU 
userid@headnode:/home/xxx' failed with status=1, 
giving up after 4 attempts

It seems that the error may be due to default MaxStartups 10 setting in the /etc/ssh/sshd_config which is too low a value and scp may be overwhelm

According to manual page
MaxStartups - Specifies the maximum number of concurrent unauthenticated connections to the sshd daemon.  Additional connections will be dropped until authentication succeeds or the LoginGraceTime
expires for a connection. The default is 10.

Try increasing the MaxStartups to 100 at /etc/ssh/sshd_config

MaxStartups 100