Normally when you get that error, it is the winsock but for it to just occur with one website, it could be a DNS issue.
You haven't said which version of Windows you are using, but this is for Win 7 which you may have to adapt for other versions.
Go Start - type ncpa.cpl and press enter.
Right click on whichever adapter you are using and select Properties - click on (TCP/IPv4) then on Properties.
Check the lower radio button for Use the following DNS server addresses and enter 8.8.8.8 in the upper row of boxes and 8.8.4.4 in the lower row.
Check the box to Validate settings upon exit - OK - Close and that will invoke the trouble shooter which should return no problems found.
You may also want to uncheck the box for (TCP/IPv6) as sometimes that can cause problems.