Lately, when trying to connect to a VPN using my Windows 8.1 machine, I kept bumping into the 619 error. After may tutorials and ideas on how to fix this issue, the following helped me:
- open command prompt with administrator privileges;
- netsh int ip reset reset.txt
- netsh winsock reset
- netsh advfirewall reset
Please remember to backup your settings, if you have a custom configuration.