knutclient does not conenct to the (remote) upsd

[Igor Ozimek]

NUT upsd runs on a Synology NAS station.
knutclient is installed on Ubuntu Studio 16.04.2 and Kubuntu 16.04.2, from the standard Ubuntu repository.

igor@UbuntuStudio-test:~$ knutclient -v
 Qt: 4.8.7
 KDE Development Platform: 4.14.16
 KNutClient: 1.0.5
 igor@UbuntuStudio-test:~$

igor@UbuntuStudio-test:~$ apt-cache policy knutclient
 knutclient:
   Installed: 1.0.5-1
   Candidate: 1.0.5-1
   Version table:
  *** 1.0.5-1 500
         500 http://si.archive.ubuntu.com/ubuntu xenial/universe amd64 Packages
         100 /var/lib/dpkg/status
 igor@UbuntuStudio-test:~$

When trying to connect to the (correct!) Synology upsd IP address and port, knutclient displays "Connection doesn't exist".

(If IP address if wrong (dead), or if port is wrong, it display "Network error, maybe net cable was plugged out." or "No connection with server." respectively, which is ok.)

Other nut clients do not have problems:
Remote upsc (from the same Ubuntu machines) works fine (see below).
The same is true for NUT-Monitor and WMNut, as well as for the WinNutClient (a knutclient-like MS windows client).

upsc dispays:

igor@UbuntuStudio-test:~$ upsc ups@192.168.1.155
Init SSL without certificate database
battery.charge: 100
battery.charge.low: 10
battery.charge.warning: 50
battery.date: 2001/09/25
battery.mfr.date: 2016/09/26
battery.runtime: 17148
battery.runtime.low: 120
battery.type: PbAc
battery.voltage: 13.8
battery.voltage.nominal: 12.0
device.mfr: American Power Conversion
device.model: Back-UPS XS 700U
device.serial: 3B1639X02759
device.type: ups
driver.name: usbhid-ups
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 5
driver.parameter.port: auto
driver.version: SDS5-0-2014Q1-DS215AIRbranch-4714-140618
driver.version.data: APC HID 0.95
driver.version.internal: 0.37
input.sensitivity: medium
input.transfer.high: 300
input.transfer.low: 140
input.voltage: 234.0
input.voltage.nominal: 230
ups.beeper.status: enabled
ups.delay.shutdown: 20
ups.firmware: 924.Z3 .I
ups.firmware.aux: Z3
ups.load: 0
ups.mfr: American Power Conversion
ups.mfr.date: 2016/09/26
ups.model: Back-UPS XS 700U
ups.productid: 0002
ups.realpower.nominal: 390
ups.serial: 3B1639X02759
ups.status: OL
ups.test.result: No test initiated
ups.timer.reboot: 0
ups.timer.shutdown: -1
ups.vendorid: 051d
igor@UbuntuStudio-test:~$