user-agent ldap invalid credentials

[moorken]

We have a strange problem on some of our PA agents on our domain controllers;

in our PA we receive logging from some DC's with the next message:

ldap cfg RED-DC3 failed to connect to server <ip-address server>, source: <ip PA>: Invalid credentials

the strange thing is that, for both domains where we have this problem, we have deployed 2 domain controllers in each domain on the same day, both were installed with the same user agent (latest 4.1.6-5) and are running under the same PAuser account, for both domains, the ldap errors look to appear only for 1 of the 2 DCs, the 2nd DC which is identical configured doesnt report any problem.  we tried to completely remove the user agent + config files and reinstalled it, but still it results in the same problem.