and have you solved the problem?
I have the same problem, but with other port, 2500.
Opened TCP \ UDP ports
TCP
IN: 8123, 20, 21, 22, 25, 53, 80, 110, 143, 443, 465, 587, 993, 995, 2030, 2031, 2082, 2083, 2086, 2087, 2095, 2096, 2500
OUT: 8123, 20, 21, 22, 25, 53, 80, 110, 113, 443, 2030, 2031, 2082, 2083, 2086, 2087, 2095, 2096, 587, 993, 995, 2080, 2443, 2500
But when I'm checking, it's still closed..
any ideas?