SVN connection refused (Ubuntu)

I'm trying to check out my repository, but it can not connect to my project archive and refuses the connection. When I try to checkout in Uni it works, but not at home. I tried to change the ~/.subversion/servers file but it didn't work. I've been struggling with this issue for a long time, can anyone help me ? svn: E170013: Konnte nicht mit Projektarchiv bei URL »https://www.myrepository.org« ; verbinden svn: E000111: Fehler beim Ausführen des Kontextes: Verbindungsaufbau abgelehnt