Connection timed out: Ensure that Port 2528 TCP is open for outbound traffic.

[jspearso]

When trying to send mail from the 3cx Debian version i get this error.
All ports are open and can successfully telnet to that port. have searched on here and followed instructions of restarting etc. but cant seem to get this to work

anyone able to offer some suggestions?

Connection timed out: Ensure that Port 2528 TCP is open for outbound traffic.

 

[jsp]

Anyone?

 

[YiannisH_3CX]

Are you using the 3CX SMPT or your own? Is this a on premise installation or hosted?

 

[Community Therapists]

We are having the same issue. last week the delivery of voicemail to email and welcome email was delayed for some users only. Now this issue is effecting almost all the users. The SMTP server test from 3CX Phone System Management is sometimes successful and sometime it times out with the same error : "Connection timed out: Ensure that Port 2528 TCP is open for outbound traffic."
No changes has been done to our firewall and we confirmed that all the required ports are open and all the outgoing traffics are allowed. We are using an on premise installation and 3CX SMTP Server.

 

[the62]

We are seeing the exact same issues with a few of our customers too..