Thank you for your reply.
The issue seems to have been resolved at this point.
There was no proxy whatsoever (Netdrive conf / system (win10) config. ).
Customer is using wifi from his smartphone with an excellent bandwidth and access is fine to anything but the site “accounts.bdrive.com”
Netdrive3 client could not access this site.
Https access (via Chrome) was also not operationnal.
Then I had the idea to use a free socks proxy, just to check.
=> it worked immediately.
Then I removed the proxy setting (to “None”) and it kept working (!!??), like something has been “unlocked” ?
I removed all proxy settings, set back local firewall, rebooted the computer and it now works fine.
Could possibly our account or session was locked at your server level ? or left in an unstable state ? and then coming from another IP with the same account put things back in motion ? I don’t know
I thaught you might have been interested to know about this.