I upgraded from 3.30 to 4.5. Network was setup and everything was working great. System had been up about 10 days when I could not connect. I rebooted system and still no go. Take 600 back to office and tried to connect via ip address and no go. Tried mac address and connected. Looked at interface and ether1 was in place were ether2 used to be. To make long story short no matter what I did it would not connect on any ether port via ip address. I tried reinstalling os with netinstall still no go. I can connect with mac address on any ether port but cannot connect with ip.

Anyone have any suggestions?

TIA

Make /system reset-configuration and then add IP on any ethernet interface and try ping RB from PC. If no success go back to 3.30

That did it thanks.