No Connection Could be made because the target machine actively refused it : IP:80

I run a few WCF services (separated into their own web directories) that all reside on the same machine. some of these services are accessed locally via machines on the internal network, and some externally via other servers over WAN.

It's just simple BasicHttpBinding.

Nothing of note has changed over the last week, yet in the last week i have been getting this message, and from different WCF services hitting that server.

Firewall I believe is not an issue. The change is sudden and seemingly random. These services have been operating without issue for 3-4 years.

Any Ideas?

One of the messages:

System.Net.Sockets.SocketException (0x80004005): No connection could be made because the target machine actively refused it xxx.xx.xxx.xxx at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddress socketAddress) at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)

The other messages I also get is there is no endpoint listening at xxxx that could accept the message. This is often caused by an incorrect address of SOAP action. Please see InnerException for more details

When I tried to load it in a browser (http://IP/Service/service.svc), during one of these episodes, the page wouldnt load. Unfortunately I can't recall what the browser was displaying, but the strange this is after displaying an error message it then came good and voila up came the service reference page.

Windows 7 IIS Advice appreciated.

web.config (pretty much out of the box, never really changed)

    <?xml version="1.0"?>
    <configuration>
    <appSettings>
    <add key="ConnectionString" value="bla"/>
  </appSettings>
  <system.web>
    <compilation debug="false" targetFramework="4.0">
      <assemblies>
        <add assembly="System.Runtime.Caching, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
      </assemblies>
    </compilation>
  </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="true"/>
          <!-- To receive exception details in faults for debugging purposes, set the value below to true.  Set to false before deployment to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true"/>
  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>
</configuration>