Since we updated this past week, we were unable to connect to Checkpoint services. Our Harmony endpoints lost connection and we could not log in to portal.checkpoint.com. All other internet access seemed completely normal. Debugging web page access we saw that some checkpoint sites were reachable and others timed out. We thought it was the internet provider and performed all kinds of tests. Also, we were not able to connect to FW using watchtower. Opened a service request with Checkpoint and they told us "it is your internet provider, not our problem". As usual, Checkpoint pride over humility and desire to help.
We reverted the 1500 to 996000575. Problem solved.
Our connection to internet is fiber PPoE with Telefonica. Only particular about this connection (bad but it has been there for a long time) is that first ip address in traceroute, the fiber default router, is 192.168.x.x
It has always worked and now works again with 996000575