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doc/trouble.html
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doc/trouble.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0//EN">
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<html>
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<head>
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<meta HTTP-EQUIV="Content-Type" CONTENT="text/html;CHARSET=iso-8859-1">
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<meta name="keywords" content="Virtual Screen, Open Source, Software" />
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<meta name="description" content="Mouse and Keyboard Sharing" />
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<link rel="stylesheet" type="text/css" href="synergy.css" media="screen" />
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<title>Synergy Troubleshooting</title>
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</head>
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<body class="main">
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<p> </p>
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<h3>Synergy Troubleshooting</h3>
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<h4>Problems</h4>
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<ol>
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<li><a href="#problem1">Cannot read configuration</a>
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<li><a href="#problem2">Connection forcefully rejected</a>
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<li><a href="#problem3">Connection timed out</a>
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<li><a href="#problem4">Cannot listen for clients</a>
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<li><a href="#problem5">Unknown screen name "XXX"</a>
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<li><a href="#problem6">Server refused client with name "XXX"</a>
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<br><a href="#problem6">A client with name "XXX" is not in the map</a>
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<li><a href="#problem7">Server already has a connected client with name "XXX"</a>
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<br><a href="#problem7">A client with name "XXX" is already connected</a>
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<li><a href="#problem8">Server has incompatible version</a>
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<li><a href="#problem9">The cursor goes to secondary screen but won't come back</a>
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</ol>
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<h4>Solutions</h4>
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<ol>
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<li><a name="problem1"></a><span class="fakelink">Cannot read configuration</span>
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<p>
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There's an error in the configuration file. This error is always
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accompanied by another message describing the problem. Use that
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message and the <a href="configuration.html">configuration documentation</a>
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to determine the fix.
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</p>
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<li><a name="problem2"></a><span class="fakelink">Connection forcefully rejected</span>
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<p>
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The client was able to contact the server computer but the server was
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not listening for clients. Possible reasons are:
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</p>
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<ul>
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<li>The client is using the wrong server
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<p>
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Make sure the client is using the hostname or IP address of the computer
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running the synergy server.
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</p>
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<li>Synergy isn't running on the server
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<p>
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Make sure the synergy server is running on the server computer. Make
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sure the server is ready to accept connections. If another program is
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using synergy's port (24800 by default) then synergy can't start unless
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you specify a different port.
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</p>
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<li>The client is using the wrong port
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<p>
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Synergy uses port 24800 by default but you can specify a different port.
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If you do use a different port you must use that port on the server and
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all clients.
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</p>
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</ul>
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<li><a name="problem3"></a><span class="fakelink">Connection timed out</span>
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<p>
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The most likely reasons for this are:
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</p>
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<ul>
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<li>A firewall
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<p>
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A firewall is a program or device that deliberately blocks network
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connections for security reasons. Typically, they'll silently drop
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packets they don't want rather than sending a rejection to the sender.
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This makes it more difficult for intruders to break in.
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</p><p>
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When synergy traffic hits a firewall and gets dropped, eventually the
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synergy client will give up waiting for a response and time out. To
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allow synergy traffic through first find all the firewalls on the
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network between and on the synergy client and server computers.
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</p><p>
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A firewall on the server or any network device between the server and
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any client should allow packets to TCP port 24800. (Port 24800 is the
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default; use whichever port you've selected.) You'll have to consult
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the manual for your operating system, device, or firewall software to
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find out how to do this.
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</p><p>
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Usually you'll won't need to adjust a firewall on client machines.
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That's because firewalls normally allow incoming traffic on any port
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they've initiated a connection on. The reasoning is, of course, if
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you started a conversation you probably want to hear the reply.
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</p>
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<li>The network is down or busy
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<p>
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Correct the network problem and try again. You might try
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<span class="code">ping</span> to see if the two computers can see
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each other on the network.
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</p>
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<li>The server is frozen
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<p>
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If the synergy server is running but locked up or very busy then the
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client may get this message. If the server is locked up then you'll
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probably have to restart it. If it's just very busy then the client
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should successfully connect automatically once the server settles down.
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</p>
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</ul>
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<li><a name="problem4"></a><span class="fakelink">Cannot listen for clients</span>
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<p>
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Synergy tried to start listening for clients but the network port is
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unavailable for some reason. Typical reasons are:
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</p>
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<ul>
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<li>No network devices
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<p>
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You must have a TCP/IP network device installed and enabled to use
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synergy.
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</p>
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<li>A synergy server is already running
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<p>
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Check that a synergy server isn't already running.
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</p>
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<li>Another program is using synergy's port
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<p>
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Only one program at a time can listen for connections on a given port.
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If the specific error is that the address is already in use and you've
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ruled out the other causes, then it's likely another program is already
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using synergy's port. By default synergy uses port 24800. Try having
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synergy use a different port number, like 24801 or 24900. Note that
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the server and all clients must use the same port number. Alternatively,
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find the other program and stop it or have it use another port.
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</p>
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</ul>
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<li><a name="problem5"></a><span class="fakelink">Unknown screen name "XXX"</span>
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<p>
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This error can be reported when reading the configuration; see
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<a href="#problem1">cannot read configuration</a>. If the configuration
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was read successfully and you get this error then it means that the
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server's screen is not in the configuration. All screens must be listed
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in the configuration.
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</p><p>
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A common reason for this is when you haven't used the system's hostname
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as its screen name. By default, synergy uses the hostname as the screen
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name. If you used a different screen name in the configuration then you
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must tell synergy what that name is. Let's say the hostname is
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<span class="code">frederick</span> but the configuration defines a screen
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named <span class="code">fred</span>. Then you must tell the server
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that its screen name is <span class="code">fred</span> by using the
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<span class="code">--name fred</span> command line option or setting
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the screen name in the advanced options dialog to
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<span class="code">fred</span>.
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</p><p>
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Alternatively, you can specify one name as an alias of another. See
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the <a href="configuration.html#aliases">configuration documentation</a>
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for details.
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</p><p>
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Another common reason for this is a mismatch between what you think the
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hostname is and what synergy thinks it is. Typically this is a problem
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with fully qualified domain names (FQDN). Perhaps you think your system
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is named <span class="code">fred</span> but synergy thinks it's
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<span class="code">fred.nowhere.com</span> or
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<span class="code">fred.local</span>. You can use either solution above
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to fix this.
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</p>
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<li><a name="problem6"></a><span class="fakelink">Server refused client with name "XXX"</span>
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<br><span class="fakelink">A client with name "XXX" is not in the map</span>
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<p>
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The client is using a screen name not in the server's configuration.
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This is essentially the same problem as <a href="#problem5">Unknown
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screen name "XXX"</a> and has the same solutions: specify another
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screen name or add an alias.
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</p>
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<li><a name="problem7"></a><span class="fakelink">Server already has a connected client with name "XXX"</span>
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<br><span class="fakelink">A client with name "XXX" is already connected</span>
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<p>
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This happens when:
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</p>
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<ul>
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<li>Two clients try use the same screen name
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<p>
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Each client must have a unique screen name. Configure at least one
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client to use a different screen name.
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</p>
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<li>One client reconnects without cleanly disconnecting
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<p>
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It's possible for a client to disconnect without the server knowing,
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usually by being disconnected from the network or possibly by going
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to sleep or even crashing. The server is left thinking the client is
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still connected so when the client reconnects the server will think
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this is a different client using the same name. Synergy will usually
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detect and correct this problem within a few seconds. If it doesn't
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then restart the server.
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</p>
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</ul>
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<li><a name="problem8"></a><span class="fakelink">Server has incompatible version</span>
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<p>
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You're using different versions of synergy on the client and server.
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You should use the same version on all systems.
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</p>
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<li><a name="problem9"></a><span class="fakelink">The cursor goes to secondary screen but won't come back</span>
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<p>
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This is <a href="faq.html#faq17">FAQ #17</a> and is also mentioned in
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the documentation for <a href="running.html#asymmetric">using synergy</a>
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and <a href="configuration.html#asymmetric">configuration</a>.
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</p>
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</ol>
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</body>
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</html>
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