Just for your information; i had the same 10061 socket errors (Connection refused) issue and tried all sorts of things including those suggested here but didnt make any head way. I found out that there is a DNS issue with the machine where the load is applied The browser opens URL with their 1P addresses but rejects URL with host names.
The solution to this is in my suggestion will be to ensure that the exact URL used in recording the scenario is tested in the target machine before applying load. Best practice is to ensure that DNS issues are non existent.
