buildbot problem

One of the buildbots I monitor had some networking issues over the weekend and now seems to be in a weird state at the master. It is *not* running locally but when I try to start it I get:

message from master: master already has a connection named 'sanitizer-ppc64le-linux' - checking its liveness

and then it shuts down.

The status on the web page shows it is "connected" but of course there is no slave actually connected and so it is not actually doing anything.

http://lab.llvm.org:8011/builders/sanitizer-ppc64le-linux

Is there something I can do from my end to fix this or must something be done at the master?

Full log from buildbot start attempt:

2015-04-13 12:22:16-0400 [-] Starting factory <buildslave.bot.BotFactory instance at 0x3fffa3e236c8>
2015-04-13 12:22:16-0400 [-] Connecting to lab.llvm.org:9990
2015-04-13 12:22:17-0400 [Broker,client] message from master: master already has a connection named 'sanitizer-ppc64le-linux' - checking its liveness
2015-04-13 12:24:39-0400 [-] Received SIGTERM, shutting down.
2015-04-13 12:24:39-0400 [Broker,client] ReconnectingPBClientFactory.failedToGetPerspective
2015-04-13 12:24:39-0400 [Broker,client] we lost the brand-new connection
2015-04-13 12:24:39-0400 [Broker,client] Lost connection to lab.llvm.org:9990
2015-04-13 12:24:39-0400 [Broker,client] Stopping factory <buildslave.bot.BotFactory instance at 0x3fffa3e236c8>
2015-04-13 12:24:39-0400 [-] Main loop terminated.
2015-04-13 12:24:39-0400 [-] Server Shut Down.