Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit.

Clear the browser cache and see if the error resolves.If not please increase the value of
LimitRequestFieldSize in httpd.conf

 IBM reference link:
http://www-01.ibm.com/support/docview.wss?uid=swg21223419
http://www-01.ibm.com/support/docview.wss?uid=swg21384722