Nautilus does not enable to connect to an NFS share

Steps to reproduce

1. Open Nautilus
2. Click on Other locations
3. In the field at the bottom, type nfs://nfs-01.eng.brq.redhat.com:/scratch
4. The Connect button stays grey and unresponsive
5. You cannot connect.

Reproducible in:

• Fedora Workstation 28 Live

Current behavior

Cannot connect an NFS share.

Expected behavior

Nautilus lets me click on Connect button and will ask for password if it needs it to mount the share.

Additional information

As root, I can do: mount nfs-01.eng.brq.redhat.com:/scratch /mnt/scratch and it connects. The rpcbind and nfs services are enabled and running.