Thank you PhoneBoy for your response,
but I can't share the log, configuration and topology, regarding from user info.
we run vpn tu and find ip address a.b.c.d on the list ike, its means have a tunnel from a.b.c.d to CP gateway right?
but the user confirm no configuration vpn from a.b.c.d to CP gateway.
#vpn tu
Peer: a.b.c.d
| Client public IP: inx invalid type (0) | | i: 2 ref: 1 |
| Authenticated at: Dec 6 08:02:27 | | i: 3 ref: 1 |
| Methods: ESP Transport 3DES SHA1 | | i: 4 ref: 1 |
| My TS: CP_Gateway | | i: 5 ref: 1 |
| Peer TS: a.b.c.d | | i: 6 ref: 1 |
| User: <L2TP_machine_user>_291593747757..|
| MSPI: 8000f3 (i: 1, p: - )
the last information from customer the endpoint(PC) have 2 vpn, 1 openvpn to a.b.c.d and 1 vpn to Checkpoint Gateway and at the CP Gateway have rule from vpn domain segmen to access a.b.c.d