It supposes to be L2TP IPSec VPN connection. No Cisco VPN client software is being used. Try to configure a router to be able to accept L2TP/IPSEC connections from the Microsoft native Clients. Can you please, as a test, change the access-list on the router (the crypto access list) into the following :
no access-list 110
access-list 110 permit udp host 126.96.36.199 eq 1701 host any any eq 5500
- second thing is that you are using router to control the access, which in my opinion will not act as stateful device so you need to allow the reply to come in from the remote vpn server so you need to alter your ACL applied at incoming interface and allow the VPN traffic from server to come in.
Usually when I am not sure what kind of traffic to be allowed then i try to capture the traffic e.g. check the logs of firewall and if using router (in your case), enable "ip route-cache flow" on the interface and then capture the traffic using "show ip cachle flow | x.x.x.x " this will give clear picture of kind of traffic ( IP address and port number).
so just try to connect the VPN from your desktop and capture the traffic hitting router interface, once confirmed make ACL accordingly.
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