Enable SSL Trace in IBM HTTP server

 Step 1: Stop IBM HTTP Server.

Step 2: Turn on IBM HTTP Server verbose logging for SSL

Append the LogLevel directive to httpd.conf:

• IBM HTTP Server 9.0 and later:

LogLevel debug ibm_ssl:trace8

• IBM HTTP Server 8.5.5 and earlier:

LogLevel debug

Append SSLTrace directive to httpd.conf (no argument)

SSLTrace

Step 3: Start HTTP Server.

Ref: https://www.ibm.com/support/pages/mustgather-ibm-http-server-ssl-handshake-and-configuration-problems