Sync error with linux client 2.6.x with debian 10

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#1

hi

i have problem syncing with nextcloud client runnning on debian buster (4.19.0-6-amd64) since client version 2.6 with my internet service provider, this is quite particular:
i can connect with 2.6.x client when using wifi via a smartphone, but it refuses when using my isp connection (which name is Free)
i can connect with browser when using wifi via a smartphone or my isp provider connection,
no problem too when i m near the server on same local network

i checked the mapping and firewall, nothing seems to be wrong since it works with firefox browser

does someone have same problem?

#2

ipv6 (not properly configured)?

#3

i think iā€™m obviously a beginner with ipv6, do you know where i can find some documentation?

#4

And also the question if you are using it within your network. Is it just your smartphone or other devices on your wifi as well? Other devices are a bit easier to debug.