I went back in time using F-droid’s dev archive, testing all the way to around when 3.9.2 was released (2019-12-07), and the issue persisted, so this is indeed some weird interaction with the latest server version(s) and particularly the conflicts detection thereof.

Version 20191206 (2019-12-07) exhibited the issue a bit differently, though probably just due to how handling of conflicts on the client end has changed between then and now: one file that did go through got renamed with ”(1)” added to it, even though there was no previously existing copy on the server. A previous attempt to upload the same file (using another client version) had failed, so that’s one possible explanation for why the server thought that a previous copy did exist.

Another file got seeminly stuck in the (client upload) queue, and watching the server log revealed that it was incrementing the added number continuously, always coming up with the same ”could not be located” exception from Sabre\DAV as above. It had run up to 80 when I cancelled the upload from the client, and would have perhaps run indefinitely if I didn’t.

{"reqId":"SmCGdnw4BzFQ5P25wMGV","level":0,"time":"2020-11-20T17:40:54+02:00","remoteAddr":"REDACTED","user":"testituutti","app":"webdav","method":"HEAD","url":"/varasto/remote.php/webdav/Testidataa/DSC_0003%20(75).JPG","message":{"Exception":"Sabre\\DAV\\Exception\\NotFound","Message":"File with name Testidataa/DSC_0003 (75).JPG could not be located","Code":0,"Trace":[{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":81,"function":"getNodeForPath","class":"OCA\\DAV\\Connector\\Sabre\\ObjectTree","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpGet","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":262,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpHead","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":251,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":319,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/apps/dav/appinfo/v1/webdav.php","line":84,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/remote.php","line":167,"args":["REDACTED/www/varasto/apps/dav/appinfo/v1/webdav.php"],"function":"require_once"}],"File":"REDACTED/www/varasto/apps/dav/lib/Connector/Sabre/ObjectTree.php","Line":173,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Android) Nextcloud-android/20191207","version":"20.0.1.1"}
{"reqId":"M3RTK4KRuOH3N0xGrp2Q","level":0,"time":"2020-11-20T17:41:00+02:00","remoteAddr":"REDACTED","user":"testituutti","app":"webdav","method":"HEAD","url":"/varasto/remote.php/webdav/Testidataa/DSC_0003%20(76).JPG","message":{"Exception":"Sabre\\DAV\\Exception\\NotFound","Message":"File with name Testidataa/DSC_0003 (76).JPG could not be located","Code":0,"Trace":[{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":81,"function":"getNodeForPath","class":"OCA\\DAV\\Connector\\Sabre\\ObjectTree","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpGet","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":262,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpHead","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":474,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":251,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/3rdparty/sabre/dav/lib/DAV/Server.php","line":319,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/apps/dav/appinfo/v1/webdav.php","line":84,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"REDACTED/www/varasto/remote.php","line":167,"args":["REDACTED/www/varasto/apps/dav/appinfo/v1/webdav.php"],"function":"require_once"}],"File":"REDACTED/www/varasto/apps/dav/lib/Connector/Sabre/ObjectTree.php","Line":173,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Android) Nextcloud-android/20191207","version":"20.0.1.1"}

I just migrated from Owncloud 8.2 to Nextcloud 9.0.52. Everything else (i.e. the web interface, desktop client) seems to work just fine, but I can’t get the Nextcloud Android app to connect with the server. I can enter the URL (no errors), my login and password, but the ”Connect” button feels totally unresponsive, it does nothing at all no matter how much I tap it. No error messages are given by the app nor is there anything correlating with the attempts in server logs.

This happens on both my phone (Nexus 5X, Android M) and tablet (Samsung Tab 4, Android L). I also tried the Beta app from F-Droid and the issue is present there too. It’s also present in both my WLAN and when using a direct 3G connection on the phone (so I don’t think the WLAN router’s firewall is the cause either).

The Owncloud app on the same devices still works with the server, although I haven’t tried logging out and re-connecting it.

The server is on shared hosting where I have shell access.

Any suggestions?