When squirrel is supposed to update (via "check" button on dialogue) , it states:
"squirrel release file couldn't be downloaded. please check your settings."
When I look at the (default) settings and press "test connection" (url being http://www.squirrel-sql.net:80/updates/stable/release.xml\), I get a "connected successfully". The URL is available.
What is remarkable: The error message comes *very fast*, almost instantly, after pressing the "check"-Button. The "test connection" takes much longer, ~ 5,6 seconds.
Actually, this is Version 3.1.1.