>> (provider: TCP Provider, error: 0 - An existing connection was forcibly closed by the remote host
Definitely related to VPN connectivity issues. TCP connection using VPN drops off frequently causing this error. check with your VPN admin or Network administrator to get it resolved.
More possible reasons listed here:
http://www.redmountainsw.com/wordpress/archives/tcp-provider-error-0-an-existing-connection-was-forcibly-closed-by-the-remote-host