For both "search on server" and "refresh key" we do not have feedback. Either the found keys are displayed (sometimes after a rather long wait were you wonder if somethings hangs...) or nothing is displayed. The latter can make you wonder if a search has taken place at all.

It would be better to show a message or knight rider, something to show that something is happening, ideally showing where it is searching right now: "searching WKD", "searching AD", ...
And in the end display either the keys with info where they were found or ~ "no key found at" and then the list of search locations.