Environment
You are using additional services via kerberos and want to check weither or not the respective servicePrincipalName is working.
Check specific servicePrincipalName
To explicitly check a servicePrincipalName use the following syntax in your kinit command:
root@ucs:~# kinit -k -t /var/lib/samba/private/extapp.keytab -S HTTP/extapp.intranet.ucs krbauth_ext && klist && kdestroy
Credentials cache: FILE:/tmp/krb5cc_0
Principal: krbauth_ext@INTRANET.UCS
Issued Expires Principal
Oct 14 12:51:55 2019 Oct 14 22:51:55 2019 HTTP/extapp.intranet.ucs@INTRANET.UCS
The -S option is to give a servicePrincipal followed by the desired servicePrincipalName and the related samAccountName.