We are running the latest bm 3.9 proxy FTF on our new BM server with Netware 6.5 SP8

When I connect to a windows 2003 IIS server through a HTTP accelerator I get the following message:
Bad Request (invalid hostname). This happens with multiple HTTP accelerators that all point to IIS servers. The accelerators that point to Apache webservers work without any problem.

When i do the same from our production server that is running BM3.9SP1 on NetWare 6.5 SP7 it works flawlessly.

When I check the IIS HTTP error log it shows the following message ( is the private address of the new bordermanager server, is the address of the W2K3 IIS server):
2009-01-15 14:03:42 3411 80 HTTP/1.1 GET /Licom/views/logon.asp 400 - Hostname -

Any Thoughts ?