This is unlikely to be because of the self-signed certificate. Self- signed certificates are correctly handled in webbrowser-app, when accessing a site using one of those you should see a warning screen, with two buttons: [back to safety] [proceed anyway]. If you choose to proceed anyway, the browser will let you browse the site, and will display a broken red lock in the address bar (as shown in your screenshot).
Can you please reproduce the issue and attach the log file for webbrowser-app. You will find it on your device at: /home/phablet/.cache/upstart/application-legacy-webbrowser-app-.log ** Changed in: webbrowser-app (Ubuntu) Status: New => Incomplete ** Summary changed: - Unable to access sites using a self-signed SSL certificate + Unable to log in to owncloud hosted on private NAS -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to webbrowser-app in Ubuntu. https://bugs.launchpad.net/bugs/1523261 Title: Unable to log in to owncloud hosted on private NAS Status in webbrowser-app package in Ubuntu: Incomplete Bug description: Hi there, I'm trying to access my owncloud hosted on my private NAS. WHAT I EXPECT: I can accept the certificate and access my OwnCloud. WHAT HAPPENS: I cannot access my OwnCloud. It shows the login prompt, but doesn't allow me to log in. As if the login button doesn't work. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/webbrowser-app/+bug/1523261/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp