my PA's use the unsecure CA..
tring to work out why.
Last I checked there was no log so ...
From what I can see (without troubleshooting this deeply on a PA), it could be because of something called "Extended Master Secret". As the webserver behind your mentionned website is a windows server this might be the reason as I have seen this reason for failed decryptions only on windows servers so far. Other things that might be a reason I cannot see in the webservers TLS configuration.
But to be sure you probably need to dig deeper (or open a support case and let PaloAlto do this work ;)
In the traffic logs or default packet captures, yes there is not enough information. But on the CLI you will be able to see what you want to.
debug dataplane packet-diag set log feature proxy all debug dataplane packet-diag set log feature ssl all
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