From https://intranet.lkpg.cendio.se/tracker/issue8768: "Thinlinc klient 3.0 har autouppdaterings feature, sitter man privat nät 192.168.0.x utan internet routing så blockerar uppdateringsrutinen väldigt länge. Detta borde ligga som en bakgrundstråd. " It could be argued that this is just a matter of bad configuration. Firewalls that discards instead of rejects packets are bad. However, this is perhaps not what people expects. Bug 1197, about abort the login, might also be relevant.