Suddenly the mails are stopped going from my coldfusion web application. I am running on Coldfsuion2016.
When I verify mail server connection i am getting the "Connection Verification Failed!" error on coldfusion administartor Server Settings > Mail.
I found the following info/exception on mail log:
com.sun.mail.util.MailConnectException: Couldn't connect to host, port: my.mail.server.com, 25; timeout 200000; nested exception is: java.net.ConnectException: Connection refused: connect
The following info is form mailsent log:
Moved undelivered mail: Mail#########.cfmail to ColdFusion2016\cfusion/Mail/Undelivr directory
Can some one help me on this?
Well, it sounds like that mail server is not accepting connections from CF. If it did before, it's not anymore. First, have you confirmed whether the connection verifies in the CF Admin? I will assume not, but do try it. And can you confirm that your code that is failing is using a cfmail without specifying such attributes as server, username, and password, such that it's using what is in that CF Admin?
You can look in the CF audit.log (with all other logs in the CF logs directory) to confirm if the mail settings have been changed, perhaps.
If you would say all is as it should be on the CF side, you need to look next at the mail server. There may be a web admin for it (or a desktop one, if you own the mail server). Perhaps you will find a log there that could explain why it's rejecting the connection (but it could be a firewall rejecting the request before it gets to the mail server).
Finally, is the CF admin (or the CFMAIL tag or equivalent) showing use of ssl/tls? If so, the problem could be that the mail server changed in terms of what SSL/TLS versions or protocols it supports. It may be that you CF2016 is running on an old JVM, and that updating the JVM could fix that. For more, see my post:
Let us know if any of this helps, or not.
Thank you Charlie. The issue was becasue of some windows Firewall settings. It got fixed long back, but forgot to reply here.
Thanks for updating us. You may want to mark my first answer as the "correct answer", at least in that I did indicate there that it could be a firewall issue, which you have now confirmed. And the other suggestions I offered could help folks with a similar problem but a different explanation. Your call, of course. Thanks, too, to Eddie for his subsequent suggestion.
In addition to Charlie's help, a simple test for connectivity is to log into the ColdFusion server and use telnet to connect to the mailserver IP address and port. If telnet cannot connect then nothing else will either.
Thank you EddieLotter.