I have created User ID to a group , allowing simultaneously 3 session from that particular ID , when i am initating VPN session from that particular ID , I can connect to single session with out any problem and i can access the internal network . simulatneously if try another session from a different machine using same user ID , i am recieving internal network ip address from VPN server, but i cannot ping to internal LAN server and excute the operations .only i am receiving IP address. But i am nt facing problem in first created session , they problem happen for second session
Are both sessions coming from clients that are behind a NAT device/firewall? Try creating a second group ID and log in the second client with the second ID. If you still have the problem it's not a "simultaneous session" problem.
If you see the problem either way and your clients are both behind the same NAT device, either have your clients log in from different locations or enable NAT traversal.