Many Legacy users using the F-Secure or Charter High Speed Internet Security programs have reported this error, but it might happen with other Internet security programs as well.
You'll need to set permissions for Legacy in your Internet security programs. Check your security programs Help file for the directions.
If this does not work, uninstall your current antivirus program and replace it with AVG Free. Please visit https://www.avg.com/en-us/free-antivirus-download#pc. In addition, if you have a firewall program, remove it and use only the Windows firewall. (We had a user recently who could not connect to the Internet in Legacy because she had 3 antivirus programs and 2 firewalls running on her system. Uninstalling the redundant security program fixed the connectivity problem instantly.)