@gertjan said in upgrade to 2.5.1 no internet:
The best log in this case is the DHCP server log.
Disconnect any of the PC that isn't working.
Look at the DHCP log.
Connect the PC back in the network.
Do you see a DHCP negotiation between your PC and pfSense in the log ?
If yes : check with your PC the network settings : mask, network, IP, DNS and gateway.
All these 4 settings are ok ?
Concerning pfSense : You changed any DNS setting ?
As an update, I have been so busy with work (I run my own business so that problem is a good problem to have) that I have not had time to get through all your (above) suggestions.
It did dawn on me that I am running a Pi-hole to capture all the ad junk. To test if Pi-hole was the issue, I disabled it and restarted Pfsense and computer on LAN. No luck, still no internet for computers or tablets.
Let me get through your above list and I'll be back here this weekend.
Patience is needed for this, I know.