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 , and you are using Microsoft Edge, then you should see a screen similar to that shown below:

OR if you are using Chrome;

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