My printer offers up a windows share. It's a guest share with no username/password required.
It used to be accessible to me by typing smb://epsonxp830.local/usbstorage into nautilus, or by browsing the Network to get there. Now I am unable to connect. I get a dialog box up that says "Password required for share usbstorage on epsonxp380.local" although it offers an Anonymous radio element option. Clicking Connect here yields nothing. Just a pause and then the same dialog comes up.
I can connect to the share using smbclient OK, and it works from a Windows machine I have access to, too. Seems to be just the gvfs (I'm guessing) integration.
$ smbclient -N //epsonxp830.local/usbstorage
WARNING: The "syslog" option is deprecated
Domain=[WORKGROUP] OS=[EPSON Storage Server] Server=[NQ 6.2]
smb: \> dir
EPSCAN D 0 Fri Feb 5 09:09:54 2016
59088 blocks of size 262144. 59072 blocks available
smb: \> %
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: gvfs 1.28.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
Uname: Linux 4.4.0-18-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Mon Apr 18 14:23:08 2016
InstallationDate: Installed on 2016-03-21 (28 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
SourcePackage: gvfs
UpgradeStatus: No upgrade log present (probably fresh install)
Confirm! The same problem. The same distro.