900/tcp port is open in Checkpoint R77.30 which is running omginitialrefs? service. This makes it vulnerable to clickjacking. Kindly help me with this.
Best practice is to have a stealth rule blocking all traffic to the firewall, even from internal networks.
The fact this port is showing up at all suggests you either don't have this rule, it is misconfigured, or you are using Client Authentication, which is a legacy feature.
Unless you are using Client Authentication, there's no reason this port should be accessed at all.
If you are using Client Authentication, I strongly encourage you to move to Identity Awareness.
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