Getting an error while Updating WCF Service Reference

I got an error like this.

There was an error downloading http://localhost:5705/UserService.svc

Unable to connect Remote Server No Connection could be made because the target machine actively refused 127.0.0.1:5705 Metadata contains a reference that cant be Resolved

'开发者_JS百科http://localhost:5705/UserService.svc' could not connect to 'http://localhost:5705/UserService.svc'

TCP error code 10064:No Connection could be made because the target machine actively refused 127.0.0.1:5705, enable to connect

Remote Server No Connection could be made because the target machine actively refused 127.0.0.1:5705

There is normally 4 reasons for this:

• The service is not running
• The meta data exchange is not enabled
• No mex endpoint is defined
• port is blocked on firewall