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Connect to server failed: java.security.cert.CertPathValidatorExeption #805

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opened 2026-04-24 23:38:55 +02:00 by adam · 7 comments
adam commented 2026-04-24 23:38:55 +02:00
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Originally created by @swedishstyle on GitHub (Dec 23, 2023).

Steps to reproduce

  1. Attempt to connect to audiobookshelf server that was working yesterday
  2. ??

Expected behaviour

  • I should be able to connect

Actual behaviour

  • "Failed to contact server (Error: java.security.cert.CertPathValidatorExeption)
    Trust anchor for certification path not found

Note: This only occurs when attempting to connect to the server via a reverse proxy address behind NGINX. This worked as of yesterday, and no updates to the server have been made since then. I can still access it without issue on the web using the reverse proxy.

Environment data

Audiobookshelf Version:

  • [ X] Android App?
  • iOS App?

Android Issue

Android version: 0.9.70-beta

Device model:
Samsung S20FE

Stock or customized system:
Stock

iOS Issue

iOS Version:
N/A

iPhone model:
N/A

Originally created by @swedishstyle on GitHub (Dec 23, 2023). ### Steps to reproduce 1. Attempt to connect to audiobookshelf server that was working yesterday 2. ?? ### Expected behaviour - I should be able to connect ### Actual behaviour - "Failed to contact server (Error: java.security.cert.CertPathValidatorExeption) Trust anchor for certification path not found Note: This only occurs when attempting to connect to the server via a reverse proxy address behind NGINX. This worked as of yesterday, and no updates to the server have been made since then. I can still access it without issue on the web using the reverse proxy. ### Environment data Audiobookshelf Version: - [ X] Android App? - [ ] iOS App? #### Android Issue Android version: 0.9.70-beta Device model: Samsung S20FE Stock or customized system: Stock #### iOS Issue iOS Version: N/A iPhone model: N/A
adam added the bug label 2026-04-24 23:38:55 +02:00
adam closed this issue 2026-04-24 23:38:56 +02:00
adam commented 2026-04-24 23:38:56 +02:00
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@DieselTech commented on GitHub (Dec 23, 2023):

Something went wrong with your reverse proxy. You can try using a SSL checking service like SSL Labs to see if there is an underlying issue with your setup / RP

https://www.ssllabs.com/ssltest/index.html

@DieselTech commented on GitHub (Dec 23, 2023): Something went wrong with your reverse proxy. You can try using a SSL checking service like SSL Labs to see if there is an underlying issue with your setup / RP https://www.ssllabs.com/ssltest/index.html
adam commented 2026-04-24 23:38:56 +02:00
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@swedishstyle commented on GitHub (Dec 23, 2023):

Something went wrong with your reverse proxy. You can try using a SSL checking service like SSL Labs to see if there is an underlying issue with your setup / RP

https://www.ssllabs.com/ssltest/index.html

image

I'm not sure where to look exactly, but nothing jumps out as obviously wrong for my proxy site. If you can tell me which section I should look at, I'd be happy to check it out

@swedishstyle commented on GitHub (Dec 23, 2023): > Something went wrong with your reverse proxy. You can try using a SSL checking service like SSL Labs to see if there is an underlying issue with your setup / RP > > https://www.ssllabs.com/ssltest/index.html ![image](https://github.com/advplyr/audiobookshelf-app/assets/32089115/4df9696f-e27f-423c-a3cd-3e8cb5119850) I'm not sure where to look exactly, but nothing jumps out as obviously wrong for my proxy site. If you can tell me which section I should look at, I'd be happy to check it out
adam commented 2026-04-24 23:38:57 +02:00
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@dziurka commented on GitHub (Dec 28, 2023):

Unfortunately I have the same problem. SSL works without any problems in the browser, but in the application it throws the same error.

@dziurka commented on GitHub (Dec 28, 2023): Unfortunately I have the same problem. SSL works without any problems in the browser, but in the application it throws the same error.
adam commented 2026-04-24 23:38:57 +02:00
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@advplyr commented on GitHub (Jan 29, 2024):

Is this resolved? I'm not sure how this is a bug with Abs

@advplyr commented on GitHub (Jan 29, 2024): Is this resolved? I'm not sure how this is a bug with Abs
adam commented 2026-04-24 23:38:58 +02:00
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@swedishstyle commented on GitHub (Jan 29, 2024):

Oh apologies, yes it was a misconfiguration on my end! Bloody DNS :)

@swedishstyle commented on GitHub (Jan 29, 2024): Oh apologies, yes it was a misconfiguration on my end! Bloody DNS :)
adam commented 2026-04-24 23:38:59 +02:00
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@ociaw commented on GitHub (Feb 6, 2024):

I just encountered this issue myself. I would get this error on the android app, but in Firefox it worked fine. The server is behind an nginx reverse proxy, with a certificate from Let's Encrypt. I believe this was caused by missing intermediate certificates (AFAIK Firefox has its own certificate store, so would not necessarily need to have the intermediate certificates provided by nginx).

I solved my issue by changing the ssl certificate directive in nginx from just cert.pem to fullchain.pem.

@ociaw commented on GitHub (Feb 6, 2024): I just encountered this issue myself. I would get this error on the android app, but in Firefox it worked fine. The server is behind an nginx reverse proxy, with a certificate from Let's Encrypt. I believe this was caused by missing intermediate certificates (AFAIK Firefox has its own certificate store, so would not necessarily need to have the intermediate certificates provided by nginx). I solved my issue by changing the `ssl certificate` directive in nginx from just `cert.pem` to `fullchain.pem`.
adam commented 2026-04-24 23:38:59 +02:00
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@pjones112000 commented on GitHub (Apr 8, 2026):

Oh apologies, yes it was a misconfiguration on my end! Bloody DNS :)

What was the solution? I'm suddenly having problems with the Android client with this error and as far as I know nothing changed.

@pjones112000 commented on GitHub (Apr 8, 2026): > Oh apologies, yes it was a misconfiguration on my end! Bloody DNS :) What was the solution? I'm suddenly having problems with the Android client with this error and as far as I know nothing changed.
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Reference: starred/audiobookshelf-app#805