Hi again,
Further troubleshooting has not proven successful. I think that this is partly 
caused by me not understanding what the No valid negotiate header error 
actually means. Most sources point in the direction of keytabs, so I suspect it 
has to do with LDAP/KDC communications?

Also, when running getcert list, the following shows up at the top. However, I 
don't know if this is caused by the other errors, or causing them?
Request ID '20210520194638':
        status: CA_UNREACHABLE
        ca-error: Error setting up ccache for "host" service on client using 
default keytab: Cannot contact any KDC for requested realm.
        stuck: no
        key pair storage: type=FILE,location='/var/kerberos/krb5kdc/kdc.key'
        certificate: type=FILE,location='/var/kerberos/krb5kdc/kdc.crt'
        CA: IPA
        issuer: CN=Certificate Authority,O=COMPANY.COM
        subject: CN=ipa.company.com,O=COMPANY.COM
        issued: 2025-06-09 11:07:31 UTC
        expires: 2027-06-10 11:07:31 UTC
        principal name: krbtgt/company....@company.com
        key usage: 
digitalSignature,nonRepudiation,keyEncipherment,dataEncipherment
        eku: id-kp-serverAuth,id-pkinit-KPKdc
        profile: KDCs_PKINIT_Certs
        pre-save command:
        post-save command: /usr/libexec/ipa/certmonger/renew_kdc_cert
        track: yes
        auto-renew: yes

The other certificates listed are all valid and shows as MONITORING. This 
failing(?) certificate also shows up when running ipa-getcert list.
If it's helpful, the instance is running in a CentOS 9 container.

Felix
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