Yes, I took a look at !aplist (and !splist), but didn't really see any correlation with the :21. And during a previous collector status update it was showing a different host with :14 as the problem, I didn't take those to be port references.
Hmmm ... well, since I've already restarted the collector (and it's back to normal processing) there is nothing in !aplist or !splist to look at now. Still though .. curious what the :14, or :21, or probably any other number could show there ... what those refer to and how to identify the property source (or datasource if it should be one of those with an issue someday) the collector status page is refering to.
