12
Configure Network Settings
Depending on your network configuration, your firewall may need to be
configured to allow access using the following ports. SMTP and DNS services
must have access to the Internet.
• DNS: port 53
• SMTP: port 25
For other system functions, the following services may be required:
• FTP: port 21, data port TCP 1024 and higher
• HTTP: port 80
• HTTPS: port 443
• LDAP: port 389 or 3268
• LDAP over SSL: port 636
• LDAP with SSL for global catalog queries: port 3269
• NTP: port 123
• SSH: port 22
• Telnet: port 23
Note If you do not open port 80 and port 443, you cannot download feature
keys.
For more information, see firewall information in the user guide for your version
of AsyncOS for Cisco Email Security Appliances.
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