Routing with CISCO Catalyst 3550

Hello Community,

i recently changed a Lancom Router into a Sophos XG.

Everything worked fine until i had to configure routing to a Subnet behind a Catalyst Switch. 

FYI: I don't know the credentials to log on the Cisco Switch. I only have access to the old Lancom Router.

Sophos: LAN 10.2.7.0(1)/24

Cisco Switch: 10.2.7.254

LAN Behind Switch 192.168.150.0/25

I created a Static Route on the Sophos 

192.168.150.0 via 10.2.7.254

and created two Firewall rules from LAN 10.2.7.0 --> LAN 192.168.150.0 and the way around. 

Routing old Lancom:

Now when i Ping any active IP in the 192.168.150.0 Network i got 1ms reply's. --> looks good

but now when i try to connect via RDP i'm not able to connect because of the default drop rule.

Is there anything i do wrong ?

Regards