OPNSense 26.1 +Caddy Reverse Proxy - Can't access Webmail after update

[javieraguilar]

Hello everyone. I've a Proxmox VE running multiple VM's using OPNsense as a firewall (and Caddy plugin as a reverse proxy). I've a Carbonio CE mail server with multiple domains. Yesterday, I was update my OPNsense fw from 24.x version to 26.1 after that, all access to Carbonio Webmail doesn't work...
Previously, I had configured Caddy to redirect each external domain that received traffic from Carbonio's webmail service, using HTTPS to the local server's IP address and port 443. I also enabled the "TLS Unsecure skip verification" option, and it worked fine. Now, none of the domains work, except when I'm on the LAN, where I can access them without issue (though I get a server certificate invalidity error). When accessing the service from outside the network, the page appears to be trying to load, and eventually displays the server's private IP address, the login screen, and a message stating that the website has taken too long to respond.
I need this service working today... I read in various links and try some suggestions without success. otherwise, can I do a Caddy rollback to previous release?
that's a neckhead!

Thanks in advance.

Regards,

Javier

[Monviech (Cedrik)]

Did you try this already? It's the only breaking (upstream) change in the update.

https://forum.opnsense.org/index.php?topic=51150.0

[javieraguilar]

Yes!! It works. For newbies as I am, also need in Handlers/Transport (section) / HTTP Headers -select new header create and save!
Thanks a lot!

Have a nice day.

J