Lately, I was working on securing IBM HTTP Server with SSL on Linux OS and gave me following errors.

[notice] (20019)DSO load failed: SSL0166E:


Failure attempting to load GSK library (libgsk7ssl.so) Configuration
 Failed

This happens when OS doesn’t have GSK dependencies library installed.

Solutions:

Install libstdc++5 library on OS and try to start  IHS.

yum install compat-libstdc++*

Note: You can install this library by doing yum install, alternatively you can contact your server administrator to do it.