Can't log in, returns error 404

[bulletproofheeb]

As the subject says, when I try to log into my server it returns a 404 error. Web access through a browser is currently working with the same IP, port, and credentials.

[toldenburger]

Same issue here, on Boox Palma 2 and on Mudita Kompakt.
Calibre web server works fine in browser, but the app gives a 404 error.

[KwasimodoZA]

Same on android - web server works fine on phone through the browser

[minervamaga]

Also receiving a 404 error. Server has been stopped and restarted, no joy. Works fine through Moon+ Reader Pro and direct web access, running on a Win 10 PC with stock Calibre app.

[mixdcrysy]

I can connect to my Calibre server via URL local and off network but I have the same 404 error anytime I've tried to use this app

[doen1el]

Hi everyone! Could you please try out version 2.0.0 and let me know if it solves your problem? You can also use the new diagnostic tool in the connection settings to check whether the app can access all the necessary endpoints.

[zatarra77]

No, it does not work:

Connection diagnostics
Base URL: https://xxx.xxx.duckdns.org/

OK Server reachable — / [302] (text/html; charset=utf-8)
-> redirect: /login?next=%2F
RDIR Book list (AJAX) — /ajax/listbooks [302] (text/html; charset=utf-8)
-> redirect: /login?next=%2Fajax%2Flistbooks%3Flimit%3D1
OK OPDS feed — /opds [200] (application/atom+xml; charset=utf-8)
OK OPDS stats — /opds/stats [200] (application/json)
OK Cover image — /opds/cover/1 [200] (image/svg+xml; charset=utf-8)

please, consider that my istance of cwa is under a container thats is exposed to internet through a reverse proxy.
I am able to reach it by my browser, both on lan and outside

How I can generate a token?

EDIT: I am able to connect inside my lan in http. when I use HTTPS I receive:

Failed to load books: Session not accepted by the server (received a login page instead of data)

[paulgault]

Hi, I installed your app via Google Play store today, v2.0.2
My Calibre install is running inside a Docker container on an Unraid server, I can access Calibre just fine from the browser on my laptop and also via the browser on my Android phone as well via url http://192.168.0.9:8081/

I just get the above 404 when trying to use the app on my phone.

Diagnostics:

Connection diagnostics
Base URL: http://192.168.0.9:8081
OK Server reachable — / [200] (text/html; charset=utf-8)
FAIL Book list (AJAX) — /ajax/listbooks [404] (text/plain; charset=utf-8)
FAIL OPDS feed — /opds [400] (text/plain; charset=utf-8)
FAIL OPDS stats — /opds/stats [404] (text/plain; charset=utf-8)
FAIL Cover image — /opds/cover/1 [404] (text/plain; charset=utf-8)

I can also access the Calibre externally via a Cloudflare tunnel, but this doesn't work via the app either as I don't think the app can negotiate the login page. If it would help, I can post redacted diagnostics from that as well. Just let me know.
Thanks,
Paul.

[doen1el]

Hi @paulgault, could you be using neither Calibre-Web nor Calibre-Web-Automated? The app does not work with the Desktop/Docker version of the default Calibre software. However, it may be supported at a later time this year.

[doen1el]

Hi @zatarra77, could you try setting Session protection to basic instead of strong? You can find this setting within the Basic Configuration of your Web Instance (/admin/config).

Also make sure your reverse proxy forwards X-Forwarded-For and X-Forwarded-Proto, and that Calibre-Web is set to trust the proxy.

[paulgault]

Hi @doen1el , Thanks for your reply. I'm using a docker image from the Unraid Community Applications store provided by linuxserver, https://github.com/linuxserver/docker-calibre/pkgs/container/calibre which has the ability to run a webserver, if enabled, in the options:

I was unaware that a separate calibre-web package was available but i can see that calibre-web is also in the Unraid store. I will look at installing that when i get a chance.

Wishing you well,
Paul.

[zatarra77]

I've just tested it and it works. Will you fix it? Il lun 22 giu 2026, 12:37 Daniel ***@***.***> ha scritto:

…

*doen1el* left a comment (doen1el/calibre-web-companion#154) <#154 (comment)> Hi @zatarra77 <https://github.com/zatarra77>, could you try setting Session protection to *basic* instead of *strong*? You can find this setting within the Basic Configuration of your Web Instance (/admin/config). — Reply to this email directly, view it on GitHub <#154?email_source=notifications&email_token=ALGWB4XYA6PNFVW44PKHOJD5BED7TA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWG4ZTSNBTGM3KM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLDGN5XXIZLSL5RWY2LDNM#issuecomment-4767394336>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ALGWB4SVCS22HEZH4MXZORL5BED7TAVCNFSNUABFKJSXA33TNF2G64TZHM4TIMZRGA2DINJQHNEXG43VMU5TIMRQHAYDQNJSGM3KC5QC> . Triage notifications, keep track of coding agent tasks and review pull requests on the go with GitHub Mobile for iOS <https://github.com/notifications/mobile/ios/ALGWB4V2U7EFHK3WCNJEW4L5BED7TA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWG4ZTSNBTGM3KM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJKTGN5XXIZLSL5UW64Y> and Android <https://github.com/notifications/mobile/android/ALGWB4R2DG35VZY76O7Z73L5BED7TA5CNFSNUABFM5UWIORPF5TWS5BNNB2WEL2JONZXKZKDN5WW2ZLOOQXTINZWG4ZTSNBTGM3KM4TFMFZW63VHNVSW45DJN5XKKZLWMVXHJLTGN5XXIZLSL5QW4ZDSN5UWI>. Download it today! You are receiving this because you were mentioned.Message ID: ***@***.***>

[doen1el]

@zatarra77 what exactly did you changed?