The suggested workaround by Vinod does not provide a solution.
Any URL must start with a protocol declaration, you cannot leave it out. When I enter the the URL as <<SERVERIP>>/PATH, as suggested by Vinod, I am unable to connect, which makes perfectly sense since the protocol declaration is missing.
When I enter the URL as HTTP://<<SERVERIP>>/PATH login also fails, because this connects to the webserver on port 80. On this port our WebDAV server doesn't listen since it uses SSL.
Without this being fixed for me Enpass basically is useless.