- Joined
- Nov 28, 2017
- Messages
- 14
- Reaction score
- 2
Hello,
Information:
- 3CX SMTP
- Both last update installed
- 1x Internal 3CX hosted on Linux (Not able to send emails)
- 1x External 3CX hosted on Linux (Able to send emails)
My customer has a internal 3CX host, which is not able to send emails, we are able to telnet to other mail providers like gmail and to our own mail server.
We cannot do a telnet to smtp-proxy.3cx.net, also a telnet to the resolved IP's that we got from wireshark is not possible.
We have made a capture on the Internal 3CX host and checked with wireshark the logs, this is the exact same thing we did on a External 3CX host which does allow us to email.
We have compared the logfiles and we see that we do not get a ACK after our host does RST ACK.
A screenshot below:
Image 1: Internal 3CX Host which stops after the red line.
Image 2: External 3CX Host which continues after the red line and does have a working email system.
(Removed our external IP)
I hope someone can help me, as our FAX is not receiving anymore since it wont send the emails to the users mailboxes and new users cannot get a Welcomes Mail anymore and we do not receive any logfiles anymore.
Information:
- 3CX SMTP
- Both last update installed
- 1x Internal 3CX hosted on Linux (Not able to send emails)
- 1x External 3CX hosted on Linux (Able to send emails)
My customer has a internal 3CX host, which is not able to send emails, we are able to telnet to other mail providers like gmail and to our own mail server.
We cannot do a telnet to smtp-proxy.3cx.net, also a telnet to the resolved IP's that we got from wireshark is not possible.
We have made a capture on the Internal 3CX host and checked with wireshark the logs, this is the exact same thing we did on a External 3CX host which does allow us to email.
We have compared the logfiles and we see that we do not get a ACK after our host does RST ACK.
A screenshot below:
Image 1: Internal 3CX Host which stops after the red line.
Image 2: External 3CX Host which continues after the red line and does have a working email system.
(Removed our external IP)
I hope someone can help me, as our FAX is not receiving anymore since it wont send the emails to the users mailboxes and new users cannot get a Welcomes Mail anymore and we do not receive any logfiles anymore.