Only the first login is successful with owncloud client on Ubuntu 16.04

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1

I’m using owncloud client on Ubuntu 16.04 to sync with Nextcloud server 10.0.

I’m able to properly configure the account and successfully sync data with the server.

But when I attempt to login for the second time, I have the “No Connection to owncloud” error.

I tried a lot of things, using Ubuntu 16.04 official repository installation and owncloud Suse repository for Ubuntu 16.04.

Both client (./Nextcloud/.owncloudsync.log) and server (/var/nextcloud/data/nextcloud.log) logs didn’t show errors.

Nextcloud server is configured to accept SSL self-signed certificate:

'check_for_working_webdav' => false,

The HSTS is configured:

<IfModule mod_headers.c>
  Header always set Strict-Transport-Security "max-age=15768000; includeSubDomains; preload"
</IfModule>

What could be the problem?
Maybe a time-out error? (first login require a lot of seconds)

TIA

2

It might be a DNS resolution time out. Is PHP able to resolve domain names?

3

I solve the problem removing owncloud-client, his dependencies (dpkg -l | grep -i owncloud), configuration file (.local/share/data/ownCloud in Ubuntu) and than installing Ubuntu 16.04 repository owncloud-client 2.1.1.

But this is strange for me, because I’m pretty sure that I had already tried that.

Is it possible that my problem was due to the fact that the first time I tried to install owncloud-client there was another PC connected to the server with the same account?