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This user was working and then stopped. However, this raises some questions:
Is this situation occurring only with this single user, or are others experiencing the same issue?
If it is an isolated case, is the user’s internet connection working properly?
Verify whether the user’s machine certificate has expired.
Update the GPO if necessary, or renew the certificate.
If this is a more global issue, it is also worth checking whether there was any problem with the ISP link.
Collect the endpoint logs from the affected machine, gather the vpnd.elg logs, and review the authentication logs for this user shown in SmartConsole for understand what is happening with this authentication.
How to collect VPN logs from the Endpoint Security Client / Endpoint Security VPN
https://support.checkpoint.com/results/sk/sk169258
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