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Press the right hand button on the front of the decoder
Read the IP address from the screen
Troubleshooting
Check the IP address of the decoder and the computer are similar
For self assigned IP addresses the first 2 segments must be the same i.e 169.254.xxx.xxx
For Automatically or manually assigned IP addresses the first 3 segments must be the same i.e. 192.168.1.xxx
If they are not the same then this is likely to be the problem