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I tried to use VNC (remote desktop viewer) on a computer that does not have a monitor but failed. When that computer has a monitor, VNC viewer works fine. Also in both cases, ssh remote access works fine. Could anyone advice me what to do. Is it required that the computer must be connected to a monitor in order for a VNC viewer to access it.

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And how did it fail? Failed to connect? The screen was all black? You found it sleeping with the town drunk? –  Chris Jul 1 '11 at 20:20
    
I bet it is the last one because it failed to connect as if the service got drunk and is not running. –  lcb Jul 1 '11 at 20:25
    
that is very odd you should test further, if you have a connection then disconnect the monitor, does the connection die? If you pull the power out of the monitor when you're connected, does the connection die? if you turn the monitor off, does the connection die? –  barlop Jul 1 '11 at 22:17
    
Hmm, @barlop you may misunderstood my question. I am using a remote desktop viewer (VNC on Ubuntu) in computer B to access computer A. When comp A has monitor I can view A desktop remotely from B, but when A has no monitor I can't view A desktop remotely from B. In both cases, ssh connection from B to A is good. –  lcb Jul 1 '11 at 22:42
    
@lcb yes I understand the remote computer is the one you speak of as being with monitor or without monitor in your tests. I'm saying try removing the monitor while connected, and see what happens. It'd allow you to be absolutely sure that this odd phenomenon is taking place, and the nature of it. added- it seems that won't be so necessary.. kobaltz has an answer there –  barlop Jul 2 '11 at 14:21

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Check out http://ubuntuforums.org/showthread.php?s=1d7ec44878f85eedc7376595b188983b&t=1471785&page=2. These people had the same issue as you.

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