Horde + Firewall

On one of our servers we have Plesk. We also installed a firewall that only open certain ports on server, ports that are strictly required.
Unfortunately, when firewall is running, my clients can not access webmail (they can see the login page, but can never login). POP3 access is working well, no other email problems. It seems that the firewall is blocking the port where horde tries to enter.

Do you know what ports should we open on firewall to be able to use horde?

 

 

 

 

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