Peer certificate chain building failed due to unable to get local issuer certificate

[JohnRumball]

Hello,

This is my first post here as I am a new customer of PaloAlto, but not new to networking. I have extensive Cisco background.

We are having an odd problem when trying to create an IKEv1 s2s tunnel between a remote PA220 and Cisco ASA 5525X headend. The PA outside interface has a dynamic address.

We have worked on this issue for days now and even opened a case with PA Support.

We are getting this error on the PA side:

IKE phase-1 negotiation is failed. Peer certificate chain building failed due to unable to get local issuer certificate

In the logs obtained in the CLI, we are seeing this information:

2020-04-23 09:28:06.066 -0400  [PERR]: Trusted CA not found for '/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Global Root CA' because of subject issuer mismatch.

2020-04-23 09:28:06.066 -0400  [PERR]: Peer certificate chain building failed due to unable to get local issuer certificate.

I have verified that the certificate chain for the public cert being used on the Cisco ASA headend is intact and complete.

Any ideas??? We have scoured the internet for solution/clues on both sides, Cisco and PA, to no avail.

Thanks in advance.

John

[l.pelland]

John,

I'm in a similar position.  I will be following this thread closely.  Thanks for posting.

[TomYoung]

Did you ever find the answer to this issue?  Typically the error "unable to get local issuer certificate" means that the CA used to issue your peer certificate is not in your certificate profile (configured under your IKE Gateway).  The certificate profile must contain the entire CA certificate chain regardless of what is in the Default Trusted Certificate Authorities.