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English Forums => General Discussion => Topic started by: recess7139 on September 13, 2026, 07:32:18 AM

Title: No WAN connection after power cut
Post by: recess7139 on September 13, 2026, 07:32:18 AM
Hi, I have came across an issue that I'm having a really hard time solving. My setup is a Thinkcentre E73 with two intel PCIe NICs, OPNsense 26.7.2_2. ISP is BT with FTTP and PPPoE logon to the ONT. If you need any more information I am happy to provide but I think that's all that's relevant

Two days ago my area had two back-to-back powercuts and the router did not recover. We have had power cuts before and usually it autoboots (UEFI setting) and gets connection once the power is back. This time it did not autoboot, and after manually starting it there was no connection to the internet. The router did get assigned a WAN IP, the ONT has power, PON, and LAN lights green. Everything seems as if nothing is wrong but it is impossible to ping the WAN IP from another network, and it is impossible to ping out of either the router itself or any device inside the network.

Things I have tried:

Notes:


Usually I have no problem troubleshooting stuff but this has left me completely stumped and I need some outside perspectives.

UPDATE:
I have switched back to fully stock ISP hardware and it is suffering the exact same problem making me think the issue is more likely with the ONT or ISP. So I will contact them and provide an update after they have been
Title: Re: No WAN connection after power cut
Post by: meyergru on September 13, 2026, 09:00:47 AM
Before trying anything else, you would have to solve that boot issue.

Did you install on ZFS, because UFS can get corrupted on power outages? That is the reason why ZFS is recommended (https://docs.opnsense.org/manual/install.html). That may already be the explanation and the remedy is clear.
Title: Re: No WAN connection after power cut
Post by: recess7139 on September 13, 2026, 11:26:56 AM
Yes my install is on ZFS, I can't currently check the boot issue due to not having physical access. I usually configure everything over wireguard but everything I have mentioned since the connection issue has been done on a video call with people who do have physical access, they're not the most technical and plugging a mouse and keyboard in etc to check the bios is out of scope. It is ridiculous I know but my options are limited at the moment. I do have the ISP router ready to go as a backup if this can't be fixed remotely