What do your logs say? Have you run a debug on the ike yet? If you are trying the connection take a look at the mp-log ikemgr.log and look at the messages. Watching that will give you a good indication where the issue might be.
Are you able to ping the public IP peer on the remote side? I would also go over your ike/ipsec settings from the vendor and make sure you are matched up.
look at the system logs and filter with (subtype eq vpn) .If you seel messages saying failing due to negotiation timeout then take a packet capture on palo alto and checkpoint to check if you are sending/receiving isakmp packets
Run a test vpn ike-sa gateway <gateway> and have a look at mp-log ikemgr.log for more info
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