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Barring any other issue or network problem, try these changes to two configuration files on all systems:
1) adding the following to the "http" section in /var/opt/silvertail/etc/nginx-scoutproxy.conf on all systems :
2) The same line should probably also be added to siteproxy.conf to be safe.
3) ScoutProxy should be restarted with a sighup
kill -1 `cat /var/run/silvertail/scoutproxy.pid`
Notice the tic marks here are the ones below the USkeyboard ~ character, not quotes or single quotes.
This causes scoutproxy to reload it's config file only.