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PhoneBoy
Admin
Admin

TCP 18264 is the Certificate Relocation List for the Internal Certificate Authority.
Anything involving certificates (VPN, SIC) will fail since the remote end will be unable to validate certificates if this port is blocked.
See also: https://support.checkpoint.com/results/sk/sk99076

TCP 264 can generally be disabled safely as it is only used by legacy Remote Access clients. 
See: https://support.checkpoint.com/results/sk/sk132712

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