I'm frequently getting the error "System.CalloutException: Read timed out" on an HTTP Service (RESTful) call I am making from an Apex class.

It doesn't appear to be a proxy/firewall issue as I *am* able to get a response.   I think I just have a slow server on the other end.

Is there any way to increase the timeout period on this call to ensure that the web service has time to respond?

Thanks!