[PM-29303] Cloudflare Proxy Causing Trust Chain Issues #6242
Description
Steps To Reproduce
I'm self hosting via vaultwarden, but this problem has recently cropped up.
I have a vaultwarden instance behind a Cloudflare proxy.
Basically, I get the error:
An error has occured
We couldn't verify the server's certificate. The certificate chain or proxy settings on your device or your Bitwarden server may not be set up correctly.
I don't get this server on the same device when using the web vault, and on other devices I don't get any issues with the official browser extension, so it seems I only have an issue with the Android app.
Expected Result
Be able to log in and do stuff on my mobile app.
Actual Result
Unable to log in.
Screenshots or Videos
No response
Additional Context
Running the latest vaultwarden behind a Cloudflare proxy. SSL Certifcate checkers I've tried (Comodo, and Digicert) both report checkmarks and show the full chain is correctly configured. On Digicert, the only warning is the issuer because my issuer is Cloudflare and not one of their trusted issuers.
This issue recently cropped up, so I think it's been something in November that surfaced this issue.
I've looked around and found github.com/bitwarden/mobile/issues/1657 but it's long since been closed. This is a reference to the first issue, also closed: #1657
Build Version
Android 2025.11.0 (20967)
What server are you connecting to?
Self hosted
Self-host Server Version
Vaultwarden 1.34.3
Environment Details
Device is a Pixel 7a running the latest OS version (Android 16, build BP3A.251105.015).
Server is running via docker, with all up to date images behind a Caddy reverse proxy.
Issue Tracking Info
- I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.