I’ve been trying to sync my contacts and tasks from my Synology NAS, which is running Contacts and Calendar, which are the recommend apps as seen in this “tested-with” article.
DAVx5 found the calendars and task lists without issues, but could not find the contacts.
I have verified that the contacts address is in the form “https://my_server_ip:5001/carddav/MyName”, which matches the system used by calendar “https://my_server_ip:5001/calddav/MyName”.
When I tried to set up two accounts, one for each service, I got the error message “Illegal character in scheme name at index 0”. It turns out that I can’t specify a specific port using “:5001” (":" being the illegal character), going against the instructions in the article I listed in the article above. As far as I understand it this is on purpose, forcing the use of base urls.
My thought at this point was that it might be a firewall issue, at which point I looked at the synology Control Panel/Info Center/Service, where the following difference could be observed:
The first tickbox is whether or not it is enabled and the second is if it is allowed through the firewall. Calender is allowed through on LAN, but not PPPoE.
This seems to be the issue, but there is a problem with this theory, which is that I can access the contacts using the carddav url on other devices without issues.
Now I’m trying to figure out if where to go next. Is it a problem with the app, because other services can find my contacts? Is it an issue with Synologys settings that there is no firewall checkbox? If it is the latter, how can I circumvent the issue?