SSL certificate has expired end date after PA decryption

Adrian_Jensen — Fri, 29 May 2026 00:21:52 GMT

Running into a weird problem with SSL decryption and a vendor's internet certificate that has broken after going through the PaloAlto. An external vendor updated their internet-facing certificate this afternoon and internal users immediately started receiving certificate expired errors. Externally the certificate appears fine, but internally the certificate now has a negative lifespan (expired before the cert was issued). Has anyone seen this before?

The cert was issued by Let's Encrypt. Checking externally the cert, it looks good. As far as I can tell the new cert is not revoked. When externally checking the cert I get a lifetime of:

260528202420Z -- 260826202419Z

However, in the PA ssl-decrypt certificate-cache, and presented to the internal client, it now has a lifetime of:

260528202451Z -- 250915160000Z

...meaning it expired Aug 15 2025, 8 months before it was issued. The certificate-cache CRL status also shows expired, but I am unable to replicate this externally.

I have cleared the decrypt cache and retried with the same effect. It seems like this is a PA bug that is breaking certificates? I have recently upgraded to 10.2.16-h8 to fix the various recent CVEs, but not seeing anything in the known issues notes that seems to relate to this.

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SSL certificate has expired end date after PA decryption