What ports are blocked?

Due to restrictions set by our providers the following ports are globally blocked and cannot under any circumstances be opened:

TCP:

• 17
• 19
• 25 (outbound)*
• 1900

UDP:

• 17
• 19
• 1900
• 53413

* Outbound SMTP over port 25 is blocked, you can still receive emails on port 25 however. To send emails you need to use a third party email delivery service over port 587. See managed email for more details.