I used Chrome at that time, and I got another problem..
I just clicked the list to connect to primary machine
and it gave me a message connecting to 192.xxx.xxx.x with black screen
but it went back to main screen
so I just tried to connect to it manually typing the IP address, it gave me an error message
‘Invalid address: Local host!’
actually I can’t understand why this got happened..
my laptop tried to connect to server which is located in PC not laptop..