So here was the solution for me coming from synology assistance (Malek was super nice to help me):
1/ On the NAS, in control panel, “external access”, tab DDNS : create a synology address… it will be something like that: <name>.synology.me
2/ On the NAS, Set a fixed ip address on the local network to the nas : to do that, go to control panel/network/tab:network interface and modify the LAN line “manual ip config” the line IP address with the number you want (for me 192.168.1.24)
3/ on your box, open ports 5001 (connect to it through its local address and modify its NAT configuration. open a port for your nas in TCP port 5001
so here, the nas is accessible fro the outside on its caldav
4/ on the android DAV5X, open it, add a account, select URL and there add put the URL: https://<name>.synology.me:5001/caldav/<your_id>/aiioyb/
and enter your <your_id> and your password (the one to connect to your nas, at the id session).
Sometimes connects to apache2-sith.crew.dreamhost.com
On my android phone Davdroid sometimes connects to apache2-sith.crew.dreamhost.com:80 ?
Anyone know why?
This might be coincidence, but apache2-sith.crew.dreamhost.com resolves to 188.8.131.52 which incidentally is the IP where (among others) the ical4j website is hosted (http://wiki.modularity.net.au/ical4j/index.php?title=Main_Page). Do you have details about the exact URL it connects to?
I don’t have the full URL, only the host - I use “NoRoot Firewall” app to check what happen on my network phone.
I don’t see Wiki URL in the app code - just http://ical4j.sourceforge.net/ that redirects to wiki - but I don’t see where app try to connect to it.
iCal4j might check for time zone updates, see http://wiki.modularity.net.au/ical4j/index.php?title=Timezones#TzUrl
For details, and to verify that no personal data are transmitted, see TimeZoneRegistryImpl:
The URLs can be found in the timezone definitions, for instance http://sourceforge.net/p/ical4j/ical4j/ci/default/tree/src/main/resources/zoneinfo/Africa/Abidjan.ics. The timezone URL for this time zone definition is http://tzurl.org/zoneinfo/Africa/Abidjan, and tzurl.org resolves to 184.108.40.206 (apache2-dap.parry.dreamhost.com).
Thank you for all these information