topic SSL Website won't load with decryption enabled in General Topics

SSL Website won't load with decryption enabled

dannon — Tue, 14 Nov 2017 21:59:31 GMT

Hello.

One of my users was trying to go to:

https://mn.b3benchmarking.com/Launch

We have SSL forward proxy enabled. If I exclude the site from decryption is comes up fine. We are not using any decryption profiles.

Can anyone tell my why the sites won't come up?

I did run a check using

https://www.ssllabs.com/ssltest/analyze.html?d=mn.b3benchmarking.com

but am not sure how to interpret the output.

Thanks,

Dannon

Re: SSL Website won't load with decryption enabled

kiwi — Wed, 15 Nov 2017 09:17:42 GMT

Hi @dannon,

What PAN-OS are you running ? Note that older PAN-OS versions have less supported ciphers :

https://www.paloaltonetworks.com/documentation/global/compatibility-matrix/supported-cipher-suites

The site you mentioned seems to support only older protocols (no TLS 1.1, 1.2 or 1.3). You might have configured a Min version on your firewall.

Also you might have configured your decryption in such a way to block unsupported versions.

Have you checked the global counters for possible issues ?

The "show counter global" command will show if a cipher suite is unsupported.

With a PCAP filter applied and using delta counters:

> show counter global filter packet-filter yes delta yes

> show counter global filter delta yes | match "ssl_server_cipher_not_supported"

Hope this helps,

-Kim.

Re: SSL Website won't load with decryption enabled

CTW1983 — Wed, 15 Nov 2017 18:08:52 GMT

After looking at the SSL Labs report for this website and seeing all the issues... Try getting in contact with the website owner to fix their site (I have had to do this myself on several occasions). Then, if they don't fix their site and you still require access, create a decryption policy that excludes this one URL.

We are running PAN-OS 8.0.5, and the webpage doesn't load for me either.

Re: SSL Website won't load with decryption enabled

dannon — Wed, 15 Nov 2017 18:46:15 GMT

Thanks.

We run 8.0.5 and I'm glad it's not unique to our setup.

I have excluded the website for the time being.

Dannon