Thanks for the suggestions. The error "Pseudo-terminal will not be allocated because stdin is not a terminal." seems to be common. Below is the relevant part of the error log. The problem occurs frequently but not every single time the page is loaded.

# open_ex: ['/usr/bin/ssh','-S','/var/lib/wwwrun/.libnet-openssh-perl/
+root-192.168.100.8-20273-555951','-l','root','192.168.100.8','--']
Pseudo-terminal will not be allocated because stdin is not a terminal.
# _waitpid(20296) => pid: 20296, rc:
# open_ex: ['/usr/bin/ssh','-O','check','-T','-S','/var/lib/wwwrun/.li
+bnet-openssh-perl/root-192.168.100.8-20273-373748','-l','root','192.1
+68.100.8','--']
# waiting for slave, timeout: 5, remaining: 5, sleep: 1
# _waitpid(20299) => pid: 20299, rc: Interrupted system call
# open_ex: ['/usr/bin/ssh','-S','/var/lib/wwwrun/.libnet-openssh-perl/
+root-192.168.100.8-20273-373748','-l','root','192.168.100.8','--']
Pseudo-terminal will not be allocated because stdin is not a terminal.
# _waitpid(20300) => pid: 20300, rc:
# open_ex: ['/usr/bin/ssh','-O','exit','-T','-S','/var/lib/wwwrun/.lib
+net-openssh-perl/root-192.168.100.8-20273-373748','-l','root','192.16
+8.100.8','--']
# waiting for slave, timeout: 5, remaining: 5, sleep: 1
# _waitpid(20301) => pid: 20301, rc: Interrupted system call
# open_ex: ['/usr/bin/ssh','-O','exit','-T','-S','/var/lib/wwwrun/.lib
+net-openssh-perl/root-192.168.100.8-20273-555951','-l','root','192.16
+8.100.8','--']
# waiting for slave, timeout: 5, remaining: 5, sleep: 1
# _waitpid(20302) => pid: 20302, rc: Interrupted system call
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