 <p>I think I've found a workaround:</p> <p>In the Eclipse instance you want to disable DDMS, select: </p> <pre><code>Windows &gt; Preferences &gt; DDMS </code></pre> <p>And change the "Base local debugger port to some unused port number (such as 22222).</p> <p>There is an error messages about not being able to connect to DDMS, but after dismissing it, it stops competing with the other Eclipse.</p>