UnknownHostException: smtp.gmail.com JIRA Software (v7.12.)

[Litus Maldives Pvt Ltd]

1). first i enabled Less Secure Apps 

2). i tested SECURE_SMTP protocol with port 465 and TLS unchecked and SMTP protocol with port 587 and TLS checked those follow as;

this is my log file

An error has occurred with sending the test email:
com.atlassian.mail.MailException: com.sun.mail.util.MailConnectException: Couldn't connect to host, port: smtp.gmail.com, 465; timeout 100000;
nested exception is:
java.net.UnknownHostException: smtp.gmail.com
at com.atlassian.mail.server.impl.SMTPMailServerImpl.sendWithMessageId(SMTPMailServerImpl.java:225)
at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:162)
at com.atlassian.jira.plugins.mail.webwork.SendTestMail.doExecute(SendTestMail.java:107)

[Gonchik Tsymzhitov]

Hi! 

Your problem related to the DNS resolving on the installed server. 

Could you login into server through ssh, and check dns resolving by command

nslookup smtp.gmail.com

After fixing this one problem,  you can check on Jira configuration side.

Cheers,

Gonchik Tsymzhitov

[Litus Maldives Pvt Ltd]

i tried, it's said above error

[Litus Maldives Pvt Ltd]

i hosted in digitalocean 

[Nic Brough -Adaptavist-]

Well, that's pretty clear - the server does not have a working DNS, so it can't look up any other systems.

You could put an ip address in for gmail, but that should be regarded as a temporary kludge to get it working for now. 

What you need to do is fix the broken DNS on the server.  That's not really an Atlassian related problem, and depends on the operating system on your server.  You might need to talk to digital ocean to get it fixed, but as you've got root on the server you could probably fix it yourself.  Look at the network settings for it and add at least one DNS server for it.

[Gonchik Tsymzhitov]

Hi! 

Let's add this one 

sudo sh -c "echo nameserver 8.8.8.8 >> /etc/resolv.conf"

And after your DNS will work if 53 port enabled :) 

Cheers,

Gonchik