slow to connect to SMB shares when secondary DC is switched off

Hi All

I seem to have a strange problem. We installed centrify express on a CentOS 6.5 box. This was installed successfully and joined the domain allowing authentication via AD. We then installed a secondary DC and running a adcheck brings up both DCs.

We now have a strange problem in that whenever we switch off the secondary DC connecting to SMB shares becomes really slow and eventually no one can connect. AFP shares connect straight away.

Its almost as if centrify is using the secondary DC as primary and is timing out whenever it can no longer see it.

Any help would be gratefully appreciated.

Thanks guys.