Click on the green HMRC button below to check that your computer is able to connect to the HMRC ‘Transaction Engine’ (the method used by HMRC to receive RTI returns)

If your computer is able to connect then you should see a screen similar to that shown below:

If you don’t see a screen similar to that shown above then above then this would suggest that something (perhaps a Firewall) is blocking your computer from accessing the HMRC Transaction Engine.