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Old 2009-06-10
Helmer Helmer is offline
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Default HTTPS web site "cannot display the webpage"

We are currently having problems accessing a certain HTTPS website: https://geas.multiasistenciaeuropea....onExplotacion/

When accessing the website outside of our firewall (for example via ADSL at home) there are no problems. When accessing the site at our office behind our Checkpoint firewall, we receive the "cannot display the webpage" error.

We have tried with Vista + IE7, XP + IE6, Vista + Firefox 3.0.5. All to no avail.

When looking at the traffic from the client (at the office) in wireshark, I can see that the client is sending SYN packets, but not receiving any SYN ACK at all. The TCP session is not starting as if the Checkpoint firewall is not allowing it to be established. When looking in Tracker, I can see the HTTPS traffic allowed to the destination, but no rejected or blocked traffic.

My theory is that the usual suspect, SmartDefense, is causing the problem but I'm not sure where to look.

We are running SPLAT R65 HFA40 in a failover cluster.

Does anybody have any ideas? Thanks!
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