WDM 4.8.5 Failing To Find Some Devices

WDM 4.8.5 Failing To Find Some Devices

I recently replaced my existing WDM 4.7.2 environment with new hardware and OS.

My new WDM environment runs WDM 4.8.5 on W2K8 R2 (64-bit).

While some devices are checking in I'm having trouble finding other existing devices of all different Wyse models (S10's, V10's, 1125, and 1200LE's)

I know there is an HAGENT version requirement for WDM 4.8.5 but terminals that I know meet the minimum reuquirement have not checked in as I would have expected.

I've run some network traces and can see one of the offending terminals having a conversation with my new WDM server but I am seeing an HTTP Error 400 Bad request - Invalid Verb in the trace.

Can anyone shed light on this?

Thanks