I'm experiencing a problem receiving a file, from within Microsoft Office Communicator 2007, on workstations that have Cisco's VPN client installed. Microsoft Office Communications Server 2007 (OCS) was recently introduced into our environment (by me - I'm the Systems Integration Analyst working on the project) and we're using Communicator as the Instant Messaging (IM) workstation client. Communicator has the ability to transfer files, within an IM, between Communicator users. File transfers, from within Communicator (send/receive), works well on XP and Vista workstations on which Cisco's VPN client is not installed (Cisco VPN client is only installed on XP machines).
This problem is being experienced on XP machines (these are the only types of machines, with Cisco's VPN client, that Communicator has been tested on). I've noticed that I can successfully receive files if I uninstall the Cisco VPN client (and restart the machine).
Additional Information: The same problem occurs on workstations that have VMware Workstation installed (without the Cisco VPN client installed). They cannot receive files transferred from within IMs, but disabling the two VMware Local Area Connections (VMnet1 and VMnet8) restores the ability to receive files. I placed a call into Microsoft support and the technician was able to dig up an article that pointed to the firewall that is installed as part of the Cisco VPN client. He also made a reference to VMware being a potential source of the problem (possibly the VMware NAT Service, but I disabled the service and experienced the same problem). Having said that ... the problem exists when VMware Workstation is removed from the equation.
Thank you in advance for any feedback that you can provide, Joe.