If you install a firewall in Cpanel, it is recommended on opening the following default ports:
TCP (inbound): 53, 80, 110, 143, 443, 465, 993, 995, 2078, 2083, 2087, 2089, 2096, 3306, 6666
UDP (inbound): 53, 465, 2078
TCP (outbound): 37, 43, 53, 80, 113, 465, 873, 2078
UDP (outbound): 53, 465, 873, 2078
Here's an explenation of what each port is for:
20, 21: sFTP, FTP
Sftp over SSH (port 20) is more secure than FTP (port 21):
22: ssh access
25, 26: smtp for exim to recieve email
Port 26 is only used if designated in Service Manager in WHM
37: rdate service
43: whois service
53: dns (named), so your sites resolve
80, 443: apache traffic; http and https
110, 995: client pop email access
113: ident service
143, 993: clients imap email access
465: SMTP TLS/SSL service
873: rsync service
2078: Used for Web Disks - WebDAV
2083: Cpanel port for client access via https
2087: Cpanel port for WHM access via https
2089: Must be open to contact Cpanel license server
2096: Must be open to contact Cpanel webmail via https
6666: Melange Chat Services
Optional:
3306: mysql access. You don't need to open this port if you don't want to allow remote mysql access, as most mysql scripts are all accessed locally.
2082: Cpanel user access. You don't need to open this port if you access Cpanel via the https port 2083.
2086: Cpanel WHM access. You don't need to open this port if you access the WHM via the https port 2087.
2095: Cpanel webmail access. You don't need to open this port if you access the webmail via the https port 2096.
What ports do I need to open in my firewall for Cpanel? Drucken
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