Event ID 5016 after CU upgrade

Question

Event ID 5016 after CU upgrade could not discover the route to the connector

Answer 1

Hi @DANIEL DIGREGORIO,

Thanks for sharing the details. Based on the Event ID 5016 ("could not discover the route to the connector") and the CU upgrade from 15.2.1118.7 to 15.2.1748.10, it's very likely that one or both servers are still in maintenance mode, which would prevent routing connectors from functioning properly.

Great callout by @Hien-L regarding maintenance mode. To take your Exchange server out of maintenance, try the following steps given in article-

https://community.spiceworks.com/t/how-to-take-exchange-server-out-of-maintenance-mode/1014433

Answer 2

Hi @DANIEL DIGREGORIO ,

Thanks for your reply.

Please understand that our forum is a public platform, and we will modify your answer and comments to cover your organization domain name in the image. Please notice to hide these personal or organization information next time you post error or screenshots to protect personal data.

Based on your reply, it seems that the current server is in maintenance mode and all components are not running and healthy. You can follow these steps to verify current server is in maintenance, and take server out of maintenance mode:

To verify that a server is ready for maintenance,

takes the DAG member out of maintenance mode and put it back into production.

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