It seems possible that "dragon" might be a corruption of "daemon"? Under this assumption, it isn't too hard to figure that "pole" might actually mean "poll". Perhaps when the CS jargon was initially translated into Japanese, somebody slipped up and used a homophone.

It appears that the user is dealing with an error that occurs intermittently with shibboleth, an SSO interface. If some daemon is polling some kind of thing in a way that triggers an error, it would probably seem to happen at random.