Solved Exim started but no response

[gate2vn]

I just rebuilt exim and exim_conf. From the mainlog, it shows exim started:

exim 4.97.1 daemon started: pid=110824, -q1h, listening for SMTPS on port 25 (IPv4) port 587 (IPv4) port 465 (IPv4)

But no response at all. Cannot send out email with normal accounts. But LFD warning, such as login root is still sent out.
Tried to connect to 25, 587 and 465 ports, all end up with error in the mainlog:

(SSL_accept): error:0A000126:SSL routines::unexpected eof while reading

Tried to rebuild exim and exim.conf again, restore exim.pl, exim.conf from backup. The same error.

Any idea to fix it?
Thanks.

 

[ericosman]

Port 25 blocked by your hosting company?

 

[gate2vn]

Nope. And mentioned, I tried with all ports, 25, 465, 587 without success.

 

[Richard G]

Tried to connect to 25, 587 and 465 ports, all end up with error in the mainlog:

I presume via your mail program since you only get an SSL EOL error?

What happens if you telnet to localhost port 25 so from the server itself.
Which domain name or hostname is this?

Are you using anything special? WHCMS, Nginx, other external tools like immunify?

 

[gate2vn]

No, nothing special. This server is for email only, no other software than the ones installed by DA. Running on Almalinux 9.
Telnet localhost seems to be OK

# telnet localhost 465
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.

Can login to webmail, but cannot send. Error from Roundcube is

SMTP Error: Connection failed: (Code: -1)

 

[ericosman]

Network Tools: DNS,IP,Email

DNS and Network troubleshooting and diagnostic tools integrated into one sweet interface.

mxtoolbox.com

What does test email server tell you?

 

[gate2vn]

SendSMTPCommand: Timeout waiting for response after 15 seconds.

LookupServer 25083ms

 

[gate2vn]

And in the server log, it's showing exactly above error:

TLS error on connection from keeper-us-east-1d.mxtoolbox.com [18.209.86.113] (SSL_accept): error:0A000126:SSL routines::unexpected eof while reading

 

[ericosman]

Go to CustomBuild, update Exim and LEGO and see what happens (?)

 

[gate2vn]

Found the reason.

tls_on_connect_ports was configured on all ports 25, 587 and 465. Need to delete 25 and 587, only keep 465. Then it's working.

 

[Richard G]

TLS should also be able to work on 587.

Out of curiosity... where did you configure that ports to be used?

 

[gate2vn]

in /etc/exim.variables.conf.custom

 

[Richard G]

In that case you can leave that line out of there. Because there is already the line tls_on_connect_ports=465 in the default exim.variables.conf file.