help configure OSX SERVER firewall to allow traffic to IP

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I inherited an OSX server and I need to configure the firewall so I can access a pc in the lan via rdc.

Who can assist on this?
Also if possible it has running Kerio Mailserver. and some users can't access theire mail.
if you can take a look at it more then welcome

Skills required:
Mac OS, System Admin
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