Some owners will enable firewalls or block ports.

The following are used by cPanel and should not be blocked:

Port

Service

Protocol

Direction

20

ftp

tcp

inbound/outbound

21

ftp

tcp,udp

inbound/outbound

22

ssh

tcp

inbound

25

smtp

tcp

inbound/outbound

26

smtp

tcp

inbound/outbound

37

rdate

tcp

outbound

43

whos

tcp

outbound

53

DNS

tcp/udp

inbound/outbound

80

http

tcp

inbound/outbound

110

pop3

tcp

inbound

113

ident

tcp

outbound

143

imap4

tcp

inbound

443

https

tcp

inbound

465

smtp

tcp/ssl, tcp/udp

inbound/outbound

873

rsync

tpc/udp

outbound

993

imap4

ssl tcp

inbound

995

pop3

ssl tcp

inbound

2082

cpanel

tcp

inbound

2083

cpanel

ssl tcp

inbound

2086

whm

tcp

inbound

2087

whm ssl

tcp

inbound

2089

cp license

tcp

outbound

2095

webmail

tcp

inbound

2096

webmail

ssl tcp

inbound

3306

mysql

tcp

inbound

6666

chat

tcp

inbound
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