Web UI tries to bind to IP "42" by default #7745

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opened 2026-02-21 19:08:49 -05:00 by deekerman · 1 comment

deekerman commented

2026-02-21 19:08:49 -05:00

Owner

Originally created by @adduxa on GitHub (Sep 14, 2018).

qBittorrent version and Operating System

qBittorrent v4.1.2
FreeBSD 11.2-RELEASE-p3 #4 r338638
Compiled from ports with nox

If on linux, libtorrent and Qt version

libtorrent-rasterbar: 1.1.9
qt5-core: 5.11.1

What is the problem

Error "Web UI: Unable to bind to IP: 42, port: 8080. Reason: The address is not available" at start with clean install without configs.

What is the expected behavior

Bind to 0.0.0.0, instead of 42

Steps to reproduce

Compile
Launch qbittorrent-nox

Extra info

If we look at https://github.com/qbittorrent/qBittorrent/blob/master/src/webui/webui.cpp#L96-L97, we can see "*" (asterisk) used as a default bind IP. And asterisk's ASCII code is 42.
I think there's automatic type detection problem somewhere.
Also, if we look at documentation, QHostAddress::Any is enum and not QHostAddress or string.
Shouldn't code above

            const auto address = (serverAddressString == "*" || serverAddressString.isEmpty())
                ? QHostAddress::Any : QHostAddress(serverAddressString);

be like

            const auto address = (serverAddressString == "*" || serverAddressString.isEmpty())
                ? QHostAddress(QHostAddress::Any) : QHostAddress(serverAddressString);

instead?

Workaround

Add

[Preferences]
WebUI\Address=*

to .config/qBittorrent/qBittorrent.conf

Originally created by @adduxa on GitHub (Sep 14, 2018). ### qBittorrent version and Operating System qBittorrent v4.1.2 FreeBSD 11.2-RELEASE-p3 #4 r338638 Compiled from ports with nox ### If on linux, libtorrent and Qt version libtorrent-rasterbar: 1.1.9 qt5-core: 5.11.1 ### What is the problem Error "Web UI: Unable to bind to IP: 42, port: 8080. Reason: The address is not available" at start with clean install without configs. ### What is the expected behavior Bind to 0.0.0.0, instead of 42 ### Steps to reproduce 1. Compile 2. Launch qbittorrent-nox ### Extra info If we look at https://github.com/qbittorrent/qBittorrent/blob/master/src/webui/webui.cpp#L96-L97, we can see `"*"` (asterisk) used as a default bind IP. And asterisk's ASCII code is 42. I think there's automatic type detection problem somewhere. Also, if we look at [documentation](https://doc.qt.io/qt-5/qhostaddress.html), `QHostAddress::Any` is `enum` and not `QHostAddress` or `string`. Shouldn't code above ``` const auto address = (serverAddressString == "*" || serverAddressString.isEmpty()) ? QHostAddress::Any : QHostAddress(serverAddressString); ``` be like ``` const auto address = (serverAddressString == "*" || serverAddressString.isEmpty()) ? QHostAddress(QHostAddress::Any) : QHostAddress(serverAddressString); ``` instead? ### Workaround Add ``` [Preferences] WebUI\Address=* ``` to `.config/qBittorrent/qBittorrent.conf`

deekerman closed this issue

2026-02-21 19:08:51 -05:00

deekerman commented

2026-02-21 19:08:54 -05:00

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Owner

@Chocobo1 commented on GitHub (Sep 14, 2018):

Thanks for the report!
Already fixed in #9365, please wait for the next release (v4.1.3) or compile using our master branch.

@Chocobo1 commented on GitHub (Sep 14, 2018): Thanks for the report! Already fixed in #9365, please wait for the next release (v4.1.3) or compile using our master branch.