A memory leak may occur with securities libraries on Windows that were shipped with JES 4 for Windows. This causes the Web Server 6.1 (bundled with JES 4) to fail to start.
Solution:Install a standalone version of Weber Server 6.1 SP5 to force the Web Server to use its own bundled securities libraries from the webserver/bin/https/bin directory. Or you can use the JES 5 installer for installing Web Server 6.1SP5 or later.