Hello @Anubhav Chaturvedi ,
1.What's the version of your Checkpoint? Have you updated to the latest one?
https://borncity.com/win/2020/12/30/checkpoint-vpn-clients-vor-v-e81-20-streiken-ab-1-1-2021-wegen-zertifikatsablauf/
2.Did you configure firewall and VPN gateway properly?
https://cloud.google.com/community/tutorials/using-cloud-vpn-with-checkpoint
https://www.youtube.com/watch?v=i6KYaJ5ZSL0
3.Did you enable the checkpoint service?
https://stackoverflow.com/questions/23624209/checkpoint-vpn-issue-connectivity-with-vpn-service-is-lost
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Best regards,
Leila
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