I found this error on of my friend’s computer, when I tried to connect to the internet using his Lava USB Dongle with BSNL SIM card, got the error message “619 A Connection to the Remote Computer Could not be established, so the port used for this connection was closed”. Some of my friends told me to clean the registry and reset the Winsock. Before you do that check your Internet balance and put the SIM card back to your mobile phone and try to connect the internet if it’s working fine on the mobile then reset the Winsock or Change the port settings.
To Reset Winsock
Open Command prompt
Type netsh winsock reset then press Enter
Then restart the computer