Workflow Mailer stops picking up notifications after IP address changes

Question

We changed the IP address of our Domain Controllers this afternoon. Soon after we did this, I noticed that notifications in the WF_NOTIFICATIONS table were not being processed.
FND_SVC_COMPONENTS showed that the mailer was running, and I was able to telnet into the Exchange server (our mail server) from the PRODuction/admin/concurrent processing tier.
OAM showed the mailer was running and I was able to stop and start the mailer from the GUI from the OAM.
Does anyone have any ideas as to whether a Application tier bounce would help with us with this?
Tks

Answer 1

Yes - there were errors in the log file (as shown below)
[Mar 2, 2010 2:16:03 PM CST]:1267560963744:Thread[outboundThreadGroup1,5,outboundThreadGroup]:0:-1:mkewis01.drs-pct.com:10.40.9.61:-1:-1:UNEXPECTED:[SVC-GSM-WFMLRSVC-17842-10006 : oracle.apps.fnd.wf.mailer.SMTPOutboundProcessor.send(Message)]:Problem occured whee n sending to {[["Sentieri, Gerald L" <[email protected]>]]} -> javax.mail.MessagingException: 451 Sender domain must resolve
There were several of these - one for each notification that was not being processed from the WF_NOTIFICATION table - with the same error message.
While we were experiencing this problem, I bounced the mailer. This had no effect.
Not sure if the IP's of the old domain controllers are cached anywhere.....and whether a biounce of just the APPS stack will force the expiry of the lease of the IP address of the old domain controllers.