title: TeamCity Build agent not connecting to TeamCity Server
body: <p>I have a TeamCity Server(9.0.3 (build 32334)) on Amazon EC2 Windows Instance.</p>
  
  <p>And i have another EC2 instance(Windows) for my Build Agents. I Installed a Build Agent on this new Instance on Port 9090 and it shows perfectly on the teamCity UI, however when i installed a second Agent on the same machine this time with port 9091, the new agent does not show up on the TeamCity UI(under connected/disconnected/unauthorized).</p>
  
  <p>However both the Agent services are running ( verified it under Windows Services).</p>
  
  <p>I followed this link for installing multiple agents :
  <a href="https://confluence.jetbrains.com/display/TCD9/Setting+up+and+Running+Additional+Build+Agents#SettingupandRunningAdditionalBuildAgents-UsingLaunchDaemonsStartupFilesonMacOSx" rel="nofollow">https://confluence.jetbrains.com/display/TCD9/Setting+up+and+Running+Additional+Build+Agents#SettingupandRunningAdditionalBuildAgents-UsingLaunchDaemonsStartupFilesonMacOSx</a></p>
  
  <p>And this is what i got from the TeamCity Agent log</p>
  
  <pre><code>buildServer.AGENT.registration - Call http://1.2.3.4/RPC2 buildServer.registerAgent3: org.apache.xmlrpc.XmlRpcException: jetbrains.buildServer.CannotPingAgentException: Unable to ping agent BuildAgent_QANEW. Check firewall and/or try to specify 'ownAddress' in the agent configuration. Details: Agent 'BuildAgent_QANEW' cannot be accessed by any of the addresses: [1.2.3.4, 2001:0:9d38:90d7:1ca5:281b:f575:9901, 1.2.3.4], (port 9091) 
  </code></pre>