Agent: Unable to start upgrade: Connection reset - remains disconnected

On a clean install on a Windows 7 machine with all the default settings the agent starts ok but will not connect.

Looking at teamcity-agent.log there are endless entries as follows

[2009-10-28 21:43:04,129]   WARN -    jetbrains.buildServer.AGENT - Unable to start upgrade: Connection reset
[2009-10-28 21:43:04,130]   INFO -    jetbrains.buildServer.AGENT - Upgrade failed, restart build agent
[2009-10-28 21:43:04,816]   INFO -    jetbrains.buildServer.AGENT - Starting TeamCity agent
[2009-10-28 21:43:06,526]   INFO -    jetbrains.buildServer.AGENT - Calculating plugins signature for possible upgrade
[2009-10-28 21:43:06,548]   INFO -    jetbrains.buildServer.AGENT - Build Agent version: 9103, plugins signature: 0
[2009-10-28 21:43:06,619]   WARN -    jetbrains.buildServer.AGENT - Calculating CPU benchmark index...
[2009-10-28 21:43:25,850]   WARN -    jetbrains.buildServer.AGENT - CPU benchmark index is set to 161
[2009-10-28 21:43:25,892]   WARN - ent.impl.AgentToolsManagerImpl - Tool ant was not found at C:\TeamCityServer\buildAgent\plugins\ant
[2009-10-28 21:43:25,892]   WARN - ent.impl.AgentToolsManagerImpl - Tool idea was not found at C:\TeamCityServer\buildAgent\plugins\idea
[2009-10-28 21:43:25,892]   WARN - ent.impl.AgentToolsManagerImpl - Tool maven was not found at C:\TeamCityServer\buildAgent\plugins\maven
[2009-10-28 21:43:26,714]   INFO -    jetbrains.buildServer.AGENT - Calculating plugins signature for possible upgrade
[2009-10-28 21:43:26,714]   INFO -    jetbrains.buildServer.AGENT - Build Agent version: 9103, plugins signature: 0
[2009-10-28 21:43:26,733]   WARN - ent.impl.AgentToolsManagerImpl - Tool ant was not found at C:\TeamCityServer\buildAgent\plugins\ant
[2009-10-28 21:43:26,734]   WARN - ent.impl.AgentToolsManagerImpl - Tool idea was not found at C:\TeamCityServer\buildAgent\plugins\idea
[2009-10-28 21:43:26,734]   WARN - ent.impl.AgentToolsManagerImpl - Tool maven was not found at C:\TeamCityServer\buildAgent\plugins\maven
[2009-10-28 21:43:26,737]   INFO - rver.plugins.PluginManagerImpl - ===========================================================
[2009-10-28 21:43:26,739]   INFO - rver.plugins.PluginManagerImpl - Scanning plugin folder: C:\TeamCityServer\buildAgent\plugins
[2009-10-28 21:43:26,740]   INFO - rver.plugins.PluginManagerImpl - Found 0 plugins: []
[2009-10-28 21:43:26,740]   INFO - rver.plugins.PluginManagerImpl - Start intializing plugins...
[2009-10-28 21:43:26,741]   INFO - rver.plugins.PluginsCollection - No plugins were loaded with standalone classloaders
[2009-10-28 21:43:26,741]   INFO - rver.plugins.PluginsCollection - Load shared classloader for 0 plugins []
[2009-10-28 21:43:26,744]   INFO - rver.plugins.PluginManagerImpl - Loaded 0 plugins: []
[2009-10-28 21:43:26,744]   INFO - rver.plugins.PluginManagerImpl - ===========================================================
[2009-10-28 21:43:26,804]   INFO - rectories.DirectoryCleanerImpl - Cannot locate .old for path 'C:\TeamCityServer\buildAgent\temp\cache'. Deleting files in place.
[2009-10-28 21:43:26,820]   INFO -    jetbrains.buildServer.AGENT - Start build agent
[2009-10-28 21:43:27,059]   WARN -    jetbrains.buildServer.AGENT - Starting agent Web server on port 9090
[2009-10-28 21:43:27,067]   INFO -    jetbrains.buildServer.AGENT - Agent Web server started
[2009-10-28 21:43:27,075]   INFO - agent.impl.AgentPortFileWriter - Writing agent runtime file to C:\TeamCityServer\buildAgent\logs\buildAgent.port
[2009-10-28 21:43:27,076]   INFO - agent.impl.AgentPortFileWriter - Launcher version is 9103
[2009-10-28 21:43:27,078]   INFO - agent.impl.AgentPortFileWriter - Writing agent runtime file to C:\TeamCityServer\buildAgent\logs\buildAgent.port :DONE!
[2009-10-28 21:43:27,078]   INFO -    jetbrains.buildServer.AGENT - Build agent started
[2009-10-28 21:43:27,205]   INFO - buildServer.AGENT.registration - Registering on server: [name: Ian-PC, ownAddress: 192.168.0.115, ownPort: 9090, buildId: <not running build>, availableRunners: [simpleRunner], availableVcs: []]
[2009-10-28 21:43:29,943]   INFO -    jetbrains.buildServer.AGENT - Upgrade call received from the build server
[2009-10-28 21:43:30,122]   INFO -    jetbrains.buildServer.AGENT - Will upgrade when become idle
[2009-10-28 21:43:30,125]   INFO -    jetbrains.buildServer.AGENT - Shutdown agent start
[2009-10-28 21:43:30,127]   INFO - agent.impl.AgentPortFileWriter - Delete agent runtime file from C:\TeamCityServer\buildAgent\logs\buildAgent.port
[2009-10-28 21:43:30,128]   INFO -    jetbrains.buildServer.AGENT - Shutdown agent WebServer start
[2009-10-28 21:43:30,148]   INFO -    jetbrains.buildServer.AGENT - Shutdown agent WebServer finish
[2009-10-28 21:43:30,148]   INFO -    jetbrains.buildServer.AGENT - Shutdown agent finish
[2009-10-28 21:43:30,249]   INFO -    jetbrains.buildServer.AGENT - Host configuration for downloading updates: HostConfiguration[host=http://localhost:8002]
[2009-10-28 21:43:30,250]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/buildAgent.zip ==> C:\TeamCityServer\buildAgent\update
[2009-10-28 21:43:30,905]   INFO - buildServer.AGENT.registration - Registered: id:1, authorizationToken:5d0662c4dc85f7c396cdcaf356681076
[2009-10-28 21:43:30,905]   INFO - buildServer.AGENT.registration - If this is the first time this agent registered on the server make sure it is authorized by administrator in the server web UI.
[2009-10-28 21:43:30,906]   WARN -    jetbrains.buildServer.AGENT - Attempt to ping agent after shutdown

[2009-10-28 21:42:08,163]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/ant.jar ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:11,780]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/antPlugin.zip ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:12,328]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/coveragePlugin.zip ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:13,579]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/crashDetector.zip ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:13,604]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/cvsAgent.zip ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:14,793]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/dotnetPlugin.zip ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:21,157]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/duplicatePlugin.zip ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:21,755]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/fxcop-agent.zip ==> C:\TeamCityServer\buildAgent\update\plugins
[2009-10-28 21:42:21,789]   INFO -    jetbrains.buildServer.AGENT - Downloading http://localhost:8002/update/plugins/idea_dist.jar ==> C:\TeamCityServer\buildAgent\update\plugins

Anyone have any ideas what is going wrong?  I have restarted the agent to no effect.