After upgrading the Symantec Endpoint Protection (SEP) manager and clients from 14.2.x to 14.3 RU5 the password is no longer accepted on the client.
Prior Release : 14.2 RU2 MP1
Release : 14.3 RU5
Incomplete client policy conversion during upgrade.
Because of the prior version, the policy setting may not have been converted correctly. To resolve this issue, please do the following:
You can try this in a test group and speed up the process by forcing a heartbeat at step 2 and 4 on your test client(s) by right clicking the shield and selecting Update Policy.