I am configuring a Cisco router to a Draytek

The VPN tunnel comes up and I can start Remote Desktop sessions from the site with the Draytek to the site with the Cisco.

but I cannot do the same thing with the other way - i.e. I cannot open Remote Desktop sessions the other way.

In th cisco log is the following code when I try to connect from the Cisco site to the Dray tek site.

Any ideas what this is and how I can solve the issue?

IPSEC: Received an ESP packet (SPI= 0x79D1D28E, sequence number= 0x1) from 81.179.236.186 (user= 81.179.236.186) to 192.168.2.2. The decapsulated inner packet doesn't match the negotiated policy in the SA. The packet specifies its destination as 224.0.0.9, its source as 81.179.236.186, and its protocol as 2. The SA specifies its local proxy as Thetford_LAN/255.255.255.0/0/0 and its remote_proxy as Bury_LAN/255.255.255.0/0/0.