SSL Decryption - Firefox error: "sec_error_reused_issuer_and_serial"

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SSL Decryption - Firefox error: "sec_error_reused_issuer_and_serial"

L2 Linker

After turning on the SSL-Decryption, firefox tells me every moring after restart this error  "sec_error_reused_issuer_and_serial", after deleleting the whole history and a restart of firefox it works, but that workaround every morning couldn't be the solution.

Anybody some suggestions??



L4 Transporter


when you get this message? when open any https websites or open the PA-WebGui?

if you get it with any https websites, please check the Trusted and Untrusted Certificates. Take a look:


The Certificates are generated all from PA. = DNS entry with the IP of your internet breakout  at your PA = DNS entry with the IP of your MGT from your PA

Export the RootCA certificate and import it in your firefox. And if you having more PAs with the same RootCA and WebGui certificates generated from you will always get the problem with FF when opening the WebGui. Try Chrome or IE.

Hi Hithead,

i had only one certificate for all purposes signed as a Subordinate-CA from my Organisation-CA???  IE has no problems with that, only FF.


FF has a problem with it. FF call it a "security feature" and IE ignore the  usage of the same CA on different sites. Difficult to explain.

But by the way: Do not use a trusted certificate with the option "forward trusted certificate". If a page is recognized as untrusted by the PA, the user will not be promoted with a certificate error. It will trust it. Generate a new certificate with PA, with the same values but do not choose an issuer (signed by) and select the usage "untrusted Certificate" for it.

"Do not use a trusted certificate with the option "forward trusted certificate".

Sorry I didn't really understand.

You mean "Do not use a trusted certificate with the option "forward untrusted certificate"?

oh, you are right 😃

I mean untrusted Smiley Happy

Okay :smileygrin:.  I have tested it and it looks good with the untrusted certificates.

And for the "security feature" in FF, i will look for a workaround Smiley Happy.

But I have one more question: Do you mean it's useful to work with OCSP-Responder or CRL-Lists? Any Ideas or best practice, because there are different meanings about that?

we don't activated that, because of a bug. But we will enable it soon again (with 6.0.2). Only crl . After enable it, you have to check the system logs, if your PA can download the crl .

BTW: read this

This has been fixed in 6.0.2 which has been released yesterday.

hi again,

okay i will test the OCSP with the new PAN-OS Version soon, but now I have another problem with the selfsigned certificate for the untrusted Certificates, because I get many certificate errors because the most intermediate CA's are not in the default trusted certificate list on the PA.

So what is the best way to solve the problem. It seems to be a little bit difficult to import all possible certificates for the Sub-CA's??

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