Ports ListManager Needs Open

ListManager requires the following ports be open on your firewall:

25 - TCP for SMTP (receiving mail; inbound)

53 - UDP for DNS lookups (outbound)

80 - Web interface

119 - TCP for NNTP (reading newsgroups; inbound)

1024-65535 - inbound

Some strict firewalls have problems with ListManager's DNS lookups. ListManager initiates the transaction on port 53, and the data returns on some higher port. Most firewalls can keep state appropriately - they recognize that the request was initiated internally, and allow the inbound connection on the higher port. However, your firewall may need some additional rules to permit DNS information to be returned correctly to ListManager.

If you are running your web server on a different machine outside your firewall, or are running scripts against ListManager from a machine outside your firewall, you will also need to have the following ports open:

2021 - TCP for Tclport