I have 1 main site (London) where the DC and Exchange server is and 1 satellite site (Colchester).
In each site the local network goes through a Sonicwall TZ 170 Standard Firewall which goes through a Draytek 2600 Plus. A VPN connection is configured at the London Site to connect to Colchester.
A Firmware upgrade was performed on the Draytek router at Colchester. SInce then Colchester cannot connect to the London site for authentication or email. They do have Internet access though.
Both Sonicwall devices are advising various messages in the log: IKE IKE negotiation aborted due to timeout, THEN > IKE Responder: Received Main Mode request (Phase 1) (from London) THEN> IKE Responder: No response - remote party timeout THEN > Received packet retransmission. Drop duplicate packet (London)
Is there anything in thr Draytek which would block access to the VPN ie passtrhough as this is the only thing that has been changed?