Openhab 1.8.2 Can't access to pictures with HABDroid outside my network

Tags: #<Tag:0x00007f6169424ee8> #<Tag:0x00007f6169424e20> #<Tag:0x00007f6169424d58>

Hello,

I own since a few days an IP Foscam camera, I interfaced it with openhab using the image url item below:
Text label=“Vidéo” icon=“video”{
Image url=“http://192.168.1.123:88/cgi-bin/CGIProxy.fcgi?cmd=snapPicture2&usr=login&pwd=password” refresh=2000
}
Here is what I get following my method of access:
-chrome on a PC outside or inside my network I can see the image
-chrome on a mobile outside or inside my network I can see the image
-HABDroid inside my network I can see the image
-HABDroid outside my network I can’t see the image and the requests made by HABDroid generate the following request logs:

192.168.1.1 -  -  [23/Apr/2016:09:21:18 +0200] "GET /openhab.app?sitemap=default&w=0100&poll=true&__async=true&__source=waHome HTTP/1.1" 200 92
192.168.1.1 -  -  [23/Apr/2016:09:21:26 +0200] "GET /openhab.app?sitemap=default&w=Home&poll=true&__async=true&__source=waHome HTTP/1.1" 200 92
192.168.1.1 -  -  [23/Apr/2016:09:21:29 +0200] "GET /openhab.app?sitemap=default&w=0100&poll=true&__async=true&__source=waHome HTTP/1.1" 200 92
XX.90.20.34 -  -  [23/Apr/2016:09:20:59 +0200] "GET /proxy?sitemap=default.sitemap&widgetId=010000 HTTP/1.1" 401 1376
XX.90.20.34 -  -  [23/Apr/2016:09:21:01 +0200] "GET /proxy?sitemap=default.sitemap&widgetId=010000 HTTP/1.1" 401 1376
XX.90.20.34 -  -  [23/Apr/2016:09:21:02 +0200] "GET /proxy?sitemap=default.sitemap&widgetId=010000 HTTP/1.1" 401 1376

My certificate is valid and issued recently.

Do you have some ideas?