Confluence is unable to connect to the mail server (response code 421)
Problem
Confluence cannot reach the mail server, returns code 421 error which indicates that the service is not available and the connection will be closed.
The following appears in the atlassian-confluence.log
:
2012-12-05 16:02:00,105 ERROR [scheduler_Worker-9] [atlassian.core.task.AbstractErrorQueuedTaskQueue] handleException com.atlassian.mail.MailException: javax.mail.MessagingException: Could not connect to SMTP host: 192.168.27.25, port: 2526, response: 421
com.atlassian.mail.MailException: javax.mail.MessagingException: Could not connect to SMTP host: 192.168.27.25, port: 2526, response: 421
at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:191)
at com.atlassian.confluence.jmx.JmxSMTPMailServer.send(JmxSMTPMailServer.java:71)
at com.atlassian.confluence.mail.template.AbstractMailNotificationQueueItem.send(AbstractMailNotificationQueueItem.java:128)
at com.atlassian.confluence.mail.template.PreRenderedMailNotificationQueueItem.send(PreRenderedMailNotificationQueueItem.java:117)
at com.atlassian.confluence.mail.template.AbstractMailNotificationQueueItem.execute(AbstractMailNotificationQueueItem.java:99)
at com.atlassian.core.task.AbstractErrorQueuedTaskQueue$TaskDecorator.execute(AbstractErrorQueuedTaskQueue.java:107)
at com.atlassian.core.task.AbstractTaskQueue.flush(AbstractTaskQueue.java:45)
at com.atlassian.core.task.AbstractErrorQueuedTaskQueue.flush(AbstractErrorQueuedTaskQueue.java:37)
at com.atlassian.quartz.jobs.TaskQueueFlushJob.doExecute(TaskQueueFlushJob.java:32)
at com.atlassian.quartz.jobs.AbstractJob.executeInternal(AbstractJob.java:86)
at org.springframework.scheduling.quartz.QuartzJobBean.execute(QuartzJobBean.java:86)
at com.atlassian.confluence.setup.quartz.DelegatingClusterAwareQuartzJobBean.executeJob(DelegatingClusterAwareQuartzJobBean.java:16)
Diagnosis
- Check that the SMTP is running on its host. If unsure, verify this with your System Administrator.
- See if you can send mail with an application other than Confluence.
- Check the physical connection from the Confluence box to the SMTP host with the following:
Windows
Linux
- If you're unable to connect to the SMTP host from the JIRA host, it may indicate a problem with the network. Please check this with your hosting provider or System Administrator.
Cause
The Mail Sever is not available/reachable.
Resolution 1
Re-create the SMTP server settings in Confluence Admin > Mail Server.
Resolution 2
If the above does not work, move the 'activation' and 'mail' jar files from /confluence/WEB-INF/lib
to <Confluence Standalone install>/lib
, restart Confluence and see if the problem persists.