Hello there,
when you open a command prompt on your server and type netstat -anb you get a list for all ports on your server, see if you find 2381 as a port and see if the hpsmhd.exe is linked to this port :
TCP [::]:2301 [::]:0 LISTENING
[hpsmhd.exe]
if there is an other exe file listening that's your problem, if you can you could change the port number of the other app. Most likley
nothing is listening on that port. Then you can check if the HP System Management Homepage service is running in Taskmanager. If that all looks fine, did you type https://localhost:2381 or http://localhost:2381 ? The first is the https adress and the second will redirect you to the https port. An other reason could be that you have a procy server setup in your browser. Set the proxy on bypass local adressen.
Kind regards,
Andrew