Connection issue to my self-hosted paperless-ngx server

Hi there,

First of all congrats on the app, it's really beautiful and the scanning is top notch !

Unfortunately, I can't use it to upload my documents to my self-hosted paperless-ngx server.
I'm logging in with my server url and have tried both option (username/password and token) but every time the result is the same.

I can log in just fine, I see the page with the initial sync, I get the sync success message, I can see my tags and documents, so the initial sync looks ok. But then, I can't upload to my server. In fact, right after signing-in, if I go to the settings, I can see that I'm not connected to my server.

If I upload a document I have an error on the POST api/documents/post_document/ invalid argument(s) no host specified in URI (which makes sense as I am not connected).

If I pull down for a refresh, the app alerts me with a "Full Sync Required" which fails with:
DioException [unknown]: null
Error: Invalid argument(s): No host specified in URI /api/tags/?page=1&page...

Extra info:
- I'm using self-signed certificate, I've activated the option in the app to allow self signed certificates.

Any idea what's wrong ?

Let me know if I can provide more info.
Best regards

Edit: App version is 0.5.9 from Jan 22, 2026

Hi Laurent, 

thanks for your bug report - I found something and I am working on a fix - but I need some time for a working test environment. 

local network, dns name, self signed certificate right? 

Thanks,
Björn

Thank you for your quick answer.

I've setup traefik, so my server is https://paperless.mydomain.com, with a self-signed certificate. I was accessing it outside of my private network in my tests from yesterday.

I've tested again today in my private network, so with the server address being my local ip and port and in this test scenario, everything works perfectly.

Hope it helps for your debug.