Bug#827786: krdc: Can't connect to Win7 VM on another system via RDP

[Ralf-Peter <rohbeck@yahoo.com>]

Package: krdc
Version: 4:16.04.1-2
Severity: important

Dear Maintainer,

connecting to a Win7 VM (under KVM) on my workstation over a LAN fails with RDP.
This applies to the current version in testing, 4:16.04.1-2. The version from jessie (4:4.14.1-1) works and so does remmina (1.1.2-3).
On the workstation, the Win7 VM runs with bridged networking on br0. Accessing it via krdc (testing, 4:16.04.1-2) locally on the workstation works
but fails when I try that from my laptop via WiFi. remmina, krdc from jessie and accessing the VM with smbclient all work from the laptop.
krdc asks for the configuration and the user name, then works for a second or two and reports
"Connection failed. You might have passed a wrong address or username."
Note it doesn't ask for a password.

Thanks,
Ralf-Peter

-- System Information:
Debian Release: stretch/sid
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'testing'), (500, 'stable'), (498, 'unstable'), (3, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.5.0-2-amd64 (SMP w/4 CPU cores)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8) (ignored: LC_ALL set to en_US.utf8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages krdc depends on:
ii  libc6                 2.22-11
ii  libkf5bookmarks5      5.22.0-2
ii  libkf5completion5     5.22.0-1
ii  libkf5configcore5     5.22.0-1
ii  libkf5configgui5      5.22.0-1
ii  libkf5configwidgets5  5.22.0-1
ii  libkf5coreaddons5     5.22.0-1
ii  libkf5dnssd5          5.22.0-1
ii  libkf5i18n5           5.22.1-1
ii  libkf5kcmutils5       5.22.0-1
ii  libkf5notifications5  5.22.0-1
ii  libkf5notifyconfig5   5.22.0-1
ii  libkf5service-bin     5.22.0-1
ii  libkf5service5        5.22.0-1
ii  libkf5wallet-bin      5.22.0-1
ii  libkf5wallet5         5.22.0-1
ii  libkf5widgetsaddons5  5.22.0-1
ii  libkf5xmlgui5         5.22.0-1
ii  libqt5core5a          5.6.1+dfsg-2
ii  libqt5gui5            5.6.1+dfsg-2
ii  libqt5widgets5        5.6.1+dfsg-2
ii  libqt5xml5            5.6.1+dfsg-2
ii  libstdc++6            6.1.1-4
ii  libvncclient1         0.9.10+dfsg-3+b1

Versions of packages krdc recommends:
ii  freerdp-x11  1.1.0~git20140921.1.440916e+dfsg1-10

Versions of packages krdc suggests:
ii  khelpcenter  4:16.04.1-1
ii  krfb         4:16.04.0-1

-- no debconf information