I previously had email notifications working in DNA Center, but they stopped working very suddenly. Currently we are running DNAC version 2.3.3.6-70045 (the latest.)
Under "Settings\External Services" I have configured our mail server under the Email tab. When I run a test under "Sender and Receivers" the test email is delivered correctly, so I know I have good end-to-end connectivity with the mail server.
To configure an email notification I followed the procedure outlined at https://www.cisco.com/c/en/us/td/docs/cloud-systems-management/network-automation-and-management/dna-center-platform/2-3-3-0/user_guide/b_dnac_platform_ug_2_3_3/b_dnac_platform_ug_2_3_3_chapter_0111.html#Cisco_Task_in_List_GUI.dita_ca236611-5a22-4c83...
No errors were given when I ran the procedure, and as I said, they worked until March 7th. When a switch went offline or an AP rebooted itself, for example, we would get appropriate notifications. But on March 7th the emails stopped being sent. I am reasonably sure that we upgraded to the current DNAC version on January 31st, so the change in behavior should not have been caused by a software update. The email notification FROM and TO addresses are the same as those used in the functional email server test.
When I go to Event Catalog, select an error that should send an email alert like "WAN-Uplink interface errors", and click the "Try-It Now" and click "Publish" button to simulate the error, it hangs for a while and then gives me the following output:
Notification: WAN-Uplink interface errors
Channel: EMAIL
Status: Failure
Message: Endpoint Connection Timed Out
I do not know if this "Try-It now" feature was working prior to March 7th, since I had no reason to test it prior to that date.
Any ideas what might be causing this, or where to find more troubleshooting help? Most of the documentation available seems to be on earlier versions of email notification which were set up quite differently.
Thanks in advance,
-Mathew Rouch
