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Editorial Team
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Asked: 2026-05-25T06:02:51+00:00

XMPP allows users to connect to the server from multiple clients simultaneously, using the

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XMPP allows users to connect to the server from multiple clients simultaneously, using the same account. I built an application that does this but if the desktop client is enabled, I do not want the users to be able to connect using a mobile client. This is for a game and being connected to both causes problems.

So what I’m wondering is:
Is it possible to detect if there are other clients connected using the same account. If I can check for other clients, I can auto logout the user.

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  1. Editorial Team

    @Flow was on the right track. If all of your client instances use the same resource, in most servers, the later-connecting client will replace the older session. The older session will get a conflict stream error, and be disconnected. You MUST be careful not to auto-reconnect with the older client, or you will have written the "dueling resources" bug.

    If you had control over your server, you have a chance at configuring it to allow a maximum of one resource for a given user, in which case the newer connection will fail with a conflict error, but you’ll have worse user interface problems if you head down that path; there will be no way to get the second client logged in, even if you wanted to.

    Finally, all resources for a given user are subscribed to that user’s presence. As long as your client sends presence in:

    <presence/>

    you will receive presence from each of your other devices:

    <presence to='user@example.com/resource1' from='user@example.com/resource2'/>
<presence to='user@example.com/resource1' from='user@example.com/resource3'/>
<presence to='user@example.com/resource1' from='user@example.com/resource4'/>

    You could use this to decide which client is current, perhaps by adding an extension to the presence like XEP-0115.

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