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    I've got the same problem.<br>
    <br>
    When I try to connect to the instance using VNC through the
    dashboard, I've got this error. I then went in
    /var/log/nova/nova-xvpvncproxy.log and it contains nothing related
    to any attempt to get connected to any instance. It seems this
    nova-xvpvncproxy process doesn't notice anything.<br>
    <br>
    <br>
    When I try to connect using VNC through virt-manager, it works.<br>
    <br>
    <br>
    Le 30/03/12 15:50, Guilherme Birk a écrit :
    <blockquote cite="mid:COL103-W21B014B47300757014F0BFA6490@phx.gbl"
      type="cite">
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      <div dir="ltr">
        Thanks for the reply.<br>
        <br>
        I've added the flags that you mentioned on my nova.conf file.
        I'm using a all in one installation, the flags are configured
        this way.<br>
        --vncserver_listen=127.0.0.1<br>
        --vncserver_proxyclient_address=127.0.0.1<br>
        --novncproxy_base_url=<a class="moz-txt-link-freetext" href="http://192.168.100.142:6080/vnc_auto.html">http://192.168.100.142:6080/vnc_auto.html</a><br>
        <br>
        The public IP of the machine with the OpenStack installation is
        192.168.100.142.<br>
        I've tried to access via browser the address
        <a class="moz-txt-link-freetext" href="http://192.168.100.142:6080/vnc_auto.html">http://192.168.100.142:6080/vnc_auto.html</a> from another machine,
        but I got nothing.<br>
        <br>
        I can ping and ssh my instances from the OpenStack machine but
        can't use VNC tab at dashboard page from another machine. The
        details and other pages from dashboard are fine.<br>
        Should I associate a public address for my instances? I'm using
        just the private address at them (10.0.0.2, 10.0.0.3, ...).<br>
        <br>
        I've restarted all the services and created new instances after
        changing the nova.conf, but nothing has changed.<br>
        <br>
        The error is a 404 not found. (<strong>Error: </strong>Unable
        to get VNC console for instance
        "7376e17b-e329-4b8b-b5fc-076e8a80c058".)<br>
        The log from dashboards page looks like this:<br>
            - Page Not Found (404)<br>
            - Requested method: GET<br>
            - Requested URL: <b><a class="moz-txt-link-freetext" href="http://192.168.100.142/nova/instances_and_volumes/instances/7376e17b-e329-4b8b-b5fc-076e8a80c058/None">http://192.168.100.142/nova/instances_and_volumes/instances/7376e17b-e329-4b8b-b5fc-076e8a80c058/None</a></b><br>
        <br>
        This is the nova-api.log relative to the VNC atempt: <a
          moz-do-not-send="true" href="http://pastebin.com/wSuyctrg">http://pastebin.com/wSuyctrg</a><br>
        <br>
        Thanks for your time.<br>
        Guilherme Birk.<br>
        <br>
        <div>
          <hr id="stopSpelling">Date: Thu, 29 Mar 2012 13:06:37 -0700<br>
          Subject: Re: [Openstack] Dashboard VNC Console failed to
          connect to server<br>
          From: <a class="moz-txt-link-abbreviated" href="mailto:sleepsonthefloor@gmail.com">sleepsonthefloor@gmail.com</a><br>
          To: <a class="moz-txt-link-abbreviated" href="mailto:guibirk@hotmail.com">guibirk@hotmail.com</a><br>
          CC: <a class="moz-txt-link-abbreviated" href="mailto:openstack@lists.launchpad.net">openstack@lists.launchpad.net</a><br>
          <br>
          How are you generating this link: <span
            class="ecxApple-style-span"
style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse;color:rgb(34,34,34)"><a
              moz-do-not-send="true"
href="http://192.168.100.142/nova/instances_and_volumes/instances/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/None"
              style="color:rgb(17,85,204)" target="_blank">http://192.168.100.142/nova/instances_and_volumes/instances/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/None</a> ?</span>
          <div>
            <font class="ecxApple-style-span" color="#222222"
              face="arial, sans-serif"><span class="ecxApple-style-span"
                style="border-collapse:collapse"><br>
              </span></font></div>
          <div><font class="ecxApple-style-span" color="#222222"
              face="arial, sans-serif"><span class="ecxApple-style-span"
                style="border-collapse:collapse">It looks like if
                horizon is behaving nicely the link would look like </span></font><span
              class="ecxApple-style-span"
style="font-family:arial,sans-serif;font-size:13px;border-collapse:collapse;color:rgb(34,34,34)"><a
                moz-do-not-send="true"
href="http://192.168.100.142/nova/instances_and_volumes/instances/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/None"
                style="color:rgb(17,85,204)" target="_blank">http://192.168.100.142/nova/instances_and_volumes/instances/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/vnc</a></span></div>
          <div><br>
          </div>
          <div>Also, could you pastie your nova-api.log somewhere?</div>
          <div><br>
          </div>
          <div>A</div>
          <div><br>
          </div>
          <div>
            <div class="ecxgmail_quote">On Thu, Mar 29, 2012 at 11:52
              AM, Guilherme Birk <span dir="ltr"><<a
                  moz-do-not-send="true"
                  href="mailto:guibirk@hotmail.com">guibirk@hotmail.com</a>></span>
              wrote:<br>
              <blockquote class="ecxgmail_quote" style="border-left:1px
                #ccc solid;padding-left:1ex">
                <div>
                  <div dir="ltr">
                    I'm having problems with it too. I'm trying to
                    connect on my instances in the VNC tab at the
                    dashboard, but I'm getting a 404 not found in the
                    URL <a moz-do-not-send="true"
href="http://192.168.100.142/nova/instances_and_volumes/instances/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/None"
                      target="_blank">http://192.168.100.142/nova/instances_and_volumes/instances/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/None</a><br>
                    <br>
                    Here is my nova-api.log. Looks like nova is having
                    problems with the POST at <a moz-do-not-send="true"
href="http://localhost:8774/v1.1/db742491018d467690ba7d3a7bb383a5/servers/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/action"
                      target="_blank">http://localhost:8774/v1.1/db742491018d467690ba7d3a7bb383a5/servers/5307a5c5-249b-4eda-b6e4-5b17d349e8ee/action</a>.<br>
                    <br>
                    Any suggestions ?<br>
                    <div>
                      <div class="ecxhm ecxHOEnZb">
                        <hr>From: <a moz-do-not-send="true"
                          href="mailto:lucianthomaz@hotmail.com">lucianthomaz@hotmail.com</a><br>
                        To: <a moz-do-not-send="true"
                          href="mailto:openstack@lists.launchpad.net">openstack@lists.launchpad.net</a><br>
                        Date: Thu, 29 Mar 2012 18:07:59 +0000<br>
                        Subject: [Openstack] Dashboard VNC Console
                        failed to connect to server</div>
                      <div>
                        <div class="h5"><br>
                          <br>
                          <div dir="ltr">
                            <font color="#366092" face="Tahoma">Hey
                              guys,</font>
                            <div><font color="#366092" face="Tahoma"><br>
                              </font></div>
                            <div><font color="#366092" face="Tahoma">I'm
                                using Dashboard with a nova-compute
                                installed in another machine, but when I
                                try access VNC Console I get the error
                                "failed to connect to server".</font></div>
                            <div><font color="#366092" face="Tahoma"><br>
                              </font></div>
                            <div><font color="#366092" face="Tahoma">Here
                                is the log -> <a
                                  moz-do-not-send="true"
                                  href="http://pastebin.com/5DZMfiNE"
                                  target="_blank">http://pastebin.com/5DZMfiNE</a></font></div>
                            <div><font color="#366092" face="Tahoma"><br>
                              </font></div>
                            <div><font color="#366092" face="Tahoma">Anyone
                                already saw this trouble?<br>
                              </font><br>
                              <br>
                              <div><font color="#333399" face="Tahoma"><strong>Lucian
                                    Thomaz </strong></font></div>
                              <br>
                            </div>
                          </div>
                          <br>
                        </div>
                      </div>
                      <div class="ecxim">_______________________________________________
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                <br>
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                <br>
              </blockquote>
            </div>
            <br>
          </div>
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      <pre wrap="">_______________________________________________
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