Blocked ports

We block certain ports from being used.

The following ports are blocked permanently, as they are commonly used for DDoS attacks. The blocks cannot be removed.

  • TCP/UDP port 17

  • TCP/UDP port 19

  • TCP/UDP port 1900

  • UDP port 53413

  • UDP port 11211

The following ports are blocked to prevent abuse, but can be removed on request.

  • TCP/UDP port 25 Please open a Technical Support Ticket and provide information on how many transactional e-mails and marketing e-mails you expect to send hourly/daily/monthly.

Last updated