Netra j Software Management Tool

When Lotus eSuite is installed on the Netra j server, the following error messages are reported:

Connection error
Something went wrong while reading the document
http://localhost:81/cgi-bin/uncgi/misc/sw-admin/cgi-bin/process_install.cgi?type=package
Either the connection was closed prematurely or some other exception occurred
Exception: java.net.SocketException
Socket closed 

However, observing the console window shows that the installation finishes successfully.