The 465 Port Not Allowed error occurs when your proxy request attempts to connect to a port that is restricted or blocked by our system. This restriction is typically in place to prevent misuse or to comply with security policies and legal requirements.

In most cases, this error arises when trying to connect to ports associated with mail protocols, such as SMTP (Simple Mail Transfer Protocol), IMAP (Internet Message Access Protocol), or POP (Post Office Protocol). These ports are commonly blocked to prevent spam or unauthorized email-related activities through our proxy network.

To resolve this issue, make sure that your request is directed to an allowed port.