We have several Windows 2008 servers, that are failing to contact the ZCM11 server(s). These six servers have not been able to contact the primary servers, we have tried the following

1.) Registered the systems using zac reg

2.) Removed the old version of the ZCM agent, and installed the newer version. ZCM11SP1

3.) Ran zac pr

4.) ran zac retr

None of these items seems to have helped, any ideas would be appreciated.