Unable to connect to remote host

When I try to do a "Check for program updates" I get a message "Unable to connect to remote host". This also has displayed each day when Dopus itself tries to call home. I have Dopus 10.0.0.0.4137.x86 under Windows 7. With my browser I can go to www.gpsoft.com. I do not use a proxy server. How can I fix this problem?

My guess is you have firewall/anti-virus/etc. software that is blocking dopus.exe from creating network connections.

The update check is to www.gpsoft.com