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Bitwarden Android Client with on-Premise server - won't resolve host name #1438

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opened 2025-11-26 22:49:07 -06:00 by GiteaMirror · 3 comments
GiteaMirror commented 2025-11-26 22:49:07 -06:00
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Originally created by @amsteel on GitHub (Apr 4, 2022).

Steps To Reproduce

Bitwarden running in Docker.
Server version: 1.47.1
Web version: 2.27.0
Firefox desktop extension version: 1.57.0
Firefox mobile extension version: 1.57.0

The server is hosted on-premise with no public access, host name: bitwardenserver.lan.local

Everything works from desktop, on Windows 10, 11 and varies Linux.

The Firefox extension works in Android.

The only issue is Android client. If bitwardenserver.lan.local is used, then it complains that the host name won't be resolved. If bitwardenserver is used, then it connects but complains the server name is not matching the name in the certificate, which is correct.

I tried IP tools and Network Analyzer on Android, the DNS lookup worked for bitwardenserver.lan.local. It returned the correct LAN IP of the server.

I am not sure if is an bug with Bitwarden or if it is just something new with Android. My phone is running Android 12.

The other thing I have noticed is that the Android browser (Firefox and Chrome), both can't open https://bitwardenserver.lan.local, saying address is not found. However both are ok to open: https://bitwardenserver and I can login to see my vault.

Anyone has similar issue?

Expected Result

Android Client should be able to login

Actual Result

hostname is not resolved

Screenshots or Videos

No response

Additional Context

No response

Operating System

Android

Operating System Version

12

Device

Poco X3 Pro

Build Version

2.17.0

Beta

  • Using a pre-release version of the application.
Originally created by @amsteel on GitHub (Apr 4, 2022). ### Steps To Reproduce Bitwarden running in Docker. Server version: 1.47.1 Web version: 2.27.0 Firefox desktop extension version: 1.57.0 Firefox mobile extension version: 1.57.0 The server is hosted on-premise with no public access, host name: bitwardenserver.lan.local Everything works from desktop, on Windows 10, 11 and varies Linux. The Firefox extension works in Android. The only issue is Android client. If bitwardenserver.lan.local is used, then it complains that the host name won't be resolved. If bitwardenserver is used, then it connects but complains the server name is not matching the name in the certificate, which is correct. I tried IP tools and Network Analyzer on Android, the DNS lookup worked for bitwardenserver.lan.local. It returned the correct LAN IP of the server. I am not sure if is an bug with Bitwarden or if it is just something new with Android. My phone is running Android 12. The other thing I have noticed is that the Android browser (Firefox and Chrome), both can't open https://bitwardenserver.lan.local, saying address is not found. However both are ok to open: https://bitwardenserver and I can login to see my vault. Anyone has similar issue? ### Expected Result Android Client should be able to login ### Actual Result hostname is not resolved ### Screenshots or Videos _No response_ ### Additional Context _No response_ ### Operating System Android ### Operating System Version 12 ### Device Poco X3 Pro ### Build Version 2.17.0 ### Beta - [ ] Using a pre-release version of the application.
GiteaMirror added the bug label 2025-11-26 22:49:07 -06:00
GiteaMirror commented 2025-11-26 22:49:08 -06:00
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@tangowithfoxtrot commented on GitHub (Apr 20, 2022):

@amsteel

You usually want to avoid using .local in your domain name, as it is a special-use domain name conflicts with the mDNS protocol used by Android (and other operating systems) to discover devices on your local network. As such, you will usually run into issues using .local for your TLD.

I recommend running through our self-hosted setup guide again, and setting your domain to something that doesn't conflict with the mDNS protocol. Something like bitwardenserver.localnetwork should work.

We use GitHub issues as a place to track bugs and other development related issues. If you need further assistance configuring Bitwarden, please contact our Customer Success team here: https://bitwarden.com/contact. You can include a link to this issue in the message content. You can also search for an answer in our help documentation or get help from other Bitwarden users on our community forums.

The issue here will be closed.

@tangowithfoxtrot commented on GitHub (Apr 20, 2022): @amsteel You usually want to avoid using `.local` in your domain name, as [it is a special-use domain name conflicts with the mDNS protocol](https://en.wikipedia.org/wiki/.local) used by Android (and other operating systems) to discover devices on your local network. As such, you will usually run into issues using `.local` for your TLD. I recommend running through our [self-hosted setup guide](https://bitwarden.com/help/install-on-premise-linux/) again, and setting your domain to something that doesn't conflict with the mDNS protocol. Something like `bitwardenserver.localnetwork` should work. We use GitHub issues as a place to track bugs and other development related issues. If you need further assistance configuring Bitwarden, please contact our Customer Success team here: <https://bitwarden.com/contact.> You can include a link to this issue in the message content. You can also search for an answer in our [help documentation](https://bitwarden.com/help/) or get help from other Bitwarden users on our [community forums](https://community.bitwarden.com/c/support/). The issue here will be closed.
GiteaMirror commented 2025-11-26 22:49:08 -06:00
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@amsteel commented on GitHub (Apr 21, 2022):

@tangowithfoxtrot If the issue is related the .local domain name, would it impact both the client and the browser extension? The extension works without any issue in Firefox (Android). That is why I think there maybe a bug in the mobile client itself and did not post it in the community forums. Any comments?

@amsteel commented on GitHub (Apr 21, 2022): @tangowithfoxtrot If the issue is related the .local domain name, would it impact both the client and the browser extension? The extension works without any issue in Firefox (Android). That is why I think there maybe a bug in the mobile client itself and did not post it in the community forums. Any comments?
GiteaMirror commented 2025-11-26 22:49:08 -06:00
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@tangowithfoxtrot commented on GitHub (Apr 21, 2022):

@amsteel Not necessarily. Some software might not need or opt to use mDNS, even if the operating system does. Since this can vary greatly, it's recommended to avoid using .local as your domain suffix.

@tangowithfoxtrot commented on GitHub (Apr 21, 2022): @amsteel Not necessarily. Some software might not need or opt to use mDNS, even if the operating system does. Since this can vary greatly, it's recommended to avoid using `.local` as your domain suffix.
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