I am trying to set up a TLSv1.3 AND a different TLSv1.2 webserver behind a palo firewall with ssl inbound decryption.
However i seem to get a lot of ssl errors and the website does not work if specific ciphers are not listed first...
For one I would like to understand why that is and even ciphers listed here have issues: https://docs.paloaltonetworks.com/compatibility-matrix/supported-cipher-suites/cipher-suites-support...
Basically, what should the apache config look like for the palo to be able to decrypt the traffic, yet still have the highest possible security as rated by https://www.ssllabs.com/ssltest/ ?
I always seem to get either "This server does not support Forward Secrecy with the reference browsers. Grade capped to B." or "There is no support for secure renegotiation. Grade reduced to A-."
There is nothing in the sslmgr.log and nothing but the General errors in the UI
the only ciphers that seem to work with Palo decryption on TLSv1.2 and Chrome/Firefox are these two:
all others error out even if those ciphers above are also available but not listed first (SSLHonorCipherOrder is set to off)
but with these ciphers which are considered weak, i dont even get forward secrecy and therefore the rating is down to B...
I wonder why the following ciphers dont work:
ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-CHCHA20-POLY1305-SHA256:CHACHA20-POLY1305-SHA256 or the ECDHE-ECDSA ones which are listed as supported but not shown in the decryption profile settings
anyone have an idea or even just an idea how to troubleshoot this further?
from a wireshark capture, i can see that if for TLSv1.2 any other supported protocols are used, the palo sens a Server Hello with the first matching cipher and right after it sends a [RST, ACK] to the client which is originated only from the firewall, the server actually sends the certificate to the palo, so the issue seems to be between the palo and the client with PANOS 10.0.1
I should probably open a support case to look into this but I thought maybe someone has already looked into this
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