I suppose that depends on the issue. Most of the time pkidiag was useful
for recreating old/expired certificates, and for that you can either use
'ndsconfig upgrade' or you can use the 'Repair Default Certificates' task
within iManager. For other troubleshooting, most of the time it is the
application which needs troubleshooting more than the certificates
themselves, so application logs/traces are appropriate.

Good luck.

If you find this post helpful and are logged into the web interface,
show your appreciation and click on the star below.

If you want to send me a private message, please let me know in the
forum as I do not use the web interface often.