Description:
impress not listening for bluetooth or wifi impress-remote connections on win10/x64

Steps to Reproduce:
1. let both android and win10 be networked over openvpn
2. configure firewall to allow udp tcp, allow soffice.bin ability to open ports
3. start libreoffice, and open a ppt 
4. ensure the remote enable settings
5. connect android impress remote via IP


I was trying to get impress remote to connect to impress on win10/x64 .

Impress-remote Did not work for impress on win10/x64 neither bluetooth nor over wifi.

Impress-Remote worked for impress on linux/x64 (fedora 26) both bluetooth and over wifi.

open ports on win10 machine
netstat -anb
..
 UDP    0.0.0.0:1598           *:*                    
 [soffice.bin]
..
 TCP    127.0.0.1:56157        127.0.0.1:5354         ESTABLISHED
 [soffice.bin]
..

On Linux
$ netstat -anp | grep -E "179[79]8"
(Not all processes could be identified, non-owned process info
 will not be shown, you would have to be root to see it all.)
tcp        0      0 0.0.0.0:1599            0.0.0.0:*               LISTEN      17998/soffice.bin   
udp        0      0 0.0.0.0:1598            0.0.0.0:*                           17998/soffice.bin   
unix  2      [ ACC ]     STREAM     LISTENING     33108769 17998/soffice.bin    /tmp/OSL_PIPE_1000_SingleOfficeIPC_5982fb913be938986e22a4d0e13d6bad
unix  3      [ ]         STREAM     CONNECTED     33108770 17998/soffice.bin    
unix  3      [ ]         STREAM     CONNECTED     33110316 17998/soffice.bin    
unix  3      [ ]         STREAM     CONNECTED     33112492 17998/soffice.bin    
unix  3      [ ]         STREAM     CONNECTED     33111711 17998/soffice.bin    
unix  2      [ ]         DGRAM                    33112511 17998/soffice.bin    
unix  3      [ ]         STREAM     CONNECTED     33112626 17998/soffice.bin    
unix  3      [ ]         STREAM     CONNECTED     33113481 17978/oosplash       


tools/options/libreoffice/advanced/enable experimental features
> tried both enabled or disabled, what I understand is experimental is not required for libreoffice-5+

tools/options/libreoffice impress/general/enable remote control
> enabled

C:\Program Files\LibreOffice 5\program\soffice.bin given tcp and udp access in firewall, all ports, all users, all interfaces, all network categories, narrowed to 192.168.21.x


* Setup specific detail: 
tested on a openvpn TAP adapter (I don't expect it to be different )
Android runs open vpn client
Linux runs open vpn client
Windows runs openvpn client
A linux server directly reachable runs the openvpn server
tested via RDP to windows host over openvpn (I don't expect openvpn rdp to interfere with anything)


Using netcat was able to confirm that udp/tcp ports can be opened, listened and texted through
It is not an mtu problem or a reachability problem

temporarily allowing udp, tcp from 192.168.21.x and listening for android connect on 1599 tcp
$ ./ncat 192.168.21.14  1599 -kl
LO_SERVER_CLIENT_PAIR
vesta
9708
nothing on 1598 tcp, 1599 udp, 1598 udp

no wifi device shows up in "Slide Show/Impress Remote", enter pin dialog window.

It's also the the case that direct bluetooth remote also does not work. 

I feel the impress remote subsystem is not starting properly and even listening for connections.


Actual Results:  
no impress remote connection

Expected Results:
the android-impress-remote should have connected and worked as on the linux machine


Reproducible: Always

User Profile Reset: No, relatively clean unpolluted machine, fresh libreoffice install

Additional Info:


User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:55.0) Gecko/20100101 Firefox/55.0