Hi,
I can just assume, but please check the following:
1. Run MSCONFIG command and check whether SAP B1 Server is ticked to be started automatically:
Note: take into account that it might take a few minute for license server to be started, so that's the reason you can't access web page from Configure Security settings
2. Check whether license server is ticked to be started automatically:
In case those settings are like they are on my screenshots, just restart your server PC and give it good time to start all the services (as mentioned, it might take a couple of minutes, even if you see that license server is up and running).
Kind Regards,
Siarhei