Why did port forwarding from VirtualBox partially stop working in Windows 8?

Question

Computer networks

Suddenly found out that different http-servers on all virtual machines became not visible. There was a usual forwarding of ports 80 <> 80. Moreover, Putty works fine on the same forwarded port 22, but http-services on the 22nd port do not work.
Chrome gives an error "...ERR_SOCKET_NOT_CONNECTED" (when connected to a different port, on which there is obviously nothing - "Unfortunately, Google Chrome cannot open the localhost:81 page"), telnet "connection lost", other virtual machines cannot do anything either download, and on the virtual machine on which the server is running, everything is available.
There are no antiviruses. But recently delivered and demolished WinPCap.
So far I have made an ssh tunnel through the same path, but I would like to understand the reasons. What can it be and how to look for, what is the problem?

Answer 1

Have you tried turning it off and on? =D