RDP Sessions dropping over IPSEC VPN

[MarkLeibbrandt]

Hi,

We have migrated a customer to a Fortigate HA pair (ios 6.4) from Palo Alto.

The issue we have is that the RDP sessions are connecting and then dropping, the users are connecting through a site-to-site IPSEC VPN over there managed  mpls network. If they connect directly to the hosted servers from outside the MPLS/ Fortigates they work fine.

Any help would be appreciated.

Ps they had no issues going through the Palo's

Thanks

[AlexC-FTNT]

Some possible problems:

- insufficient bandwidth

- DoS policy (if used) being triggered by the RDP traffic 

- FSSO authentication (if used) problems after logging in the remote server

- offloading issue (disable NP offloading for a test on the policy allowing the traffic) 

- traffic problems not related to the hosts (run a packet capture)

- not excluding the possibility of a bug