problem in VPN connection acess in TMG

I have installed TMG Server in head office, after configuring TMG, everything is working properly like emails, internet acess, except head office users are unable to connect with remote site ERP Server using VPN dial up connection.
TMG is blocking VPN traffic, users are unable to dial VPN connection to acess remote office ERP Server.
I have made rule for this issue.
Protocol = All Outbound Traffic / VPN Protocol (PPTP-L2TP)
Action = Allow
Source = Local host and Internal Host
Destination = Remote TP-Link Router Static IP (
Users = All

After activating the above rule, while dialing VPN Connectiopn from head office, users get the following errors.
Any one please give me some suitable idea to resolve the issue.

Error 800: The remote connection was not made because the attempted VPN tunnels failed. the VPN server might be unreachable. If this connection is using IPSEC or L2TP tunnel, the security parameters required for IPSEC negotiation might not be configured properly.
September 2nd, 2015 6:39pm

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