5 thoughts on “Agents can not login after CUCM Upgrade

  1. Wow ty so much for this article! Helped me to shorted troubleshooting time of this problem to 5 minutes.

  2. Glad I could help! I, like you, checked “the Google” and when I didn’t get any immediate hits, I figured my post here could save someone else a little bit of time. 🙂

  3. Just did an upgrade of a 7.1(5) to 8.6(2) in the customer’s lab and hit this exact problem with CTIOS Agent Desktop. A Google search on “Error 10158” brought me here and pilotmike’s solution is correct. Have to reset the phones that use the profile as stated.

    One could probably set this to “IPv4 only” before the upgrade to avoid the second phone reset after the upgrade.

    Much appreciated, pilotmike.

  4. Thanks so much! This was very helpful for us as we had the IPv4 and IPv6 option enabled.


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