Desktop cliet fails to sync, phone client fine

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Nextcloud version 13.0.6:
Operating system and version _desktop:pureOS (SMP Debian 4.17.17-1), Server: ubuntu 16.04.5 _:
Apache or nginx version Apache 2.4.18:
PHP version 7.1.20-1:

The issue you are facing:
When trying to sync files with the nextcloud client on my laptop I get a server unavailable error in the nextcloud client, the weblogs read: Sabre\DAV\Exception\ServiceUnavailable: Could not open the file. However, on my phone, the client works fine. Both are using app-specific passwords even though I don’t have 2fa.

Is this the first time you’ve seen this error? Y: I have used nextcloud clients on other laptops with success.

Steps to replicate it:

  1. install nextcloud server and client as normal
  2. attempt to sync files from desktop

The output of your Nextcloud log in Admin > Logging:

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

$CONFIG = array (
  'instanceid' => 'oc8o9zobbovw',
  'passwordsalt' => '77oj2euJSZYfj+1oF0f7G1Bg/QWqNa',
  'secret' => 'W7lpt8Hcoh25BG9Iv//T2ESy2DB/dLjHYKSaZ8Gd3Imm46NP',
  'trusted_domains' => 
  array (
    0 => '',
  'datadirectory' => '/var/nextcloud_data/data',
  'overwrite.cli.url' => '',
  'dbtype' => 'mysql',
  'version' => '',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'nextclouduser',
  'dbpassword' => 'riot-sabine-ad',
  'installed' => true,
  'mail_smtpmode' => 'smtp',
  'mail_smtpauthtype' => 'LOGIN',
  'mail_from_address' => 'gsykes537',
  'mail_domain' => '',
  'mail_smtpauth' => 1,
  'mail_smtpsecure' => 'tls',
  'mail_smtphost' => '',
  'mail_smtpport' => '587',
  'mail_smtpname' => 'gsykes537',
  'mail_smtppassword' => 'iypshfpyzkiekojf',
  0 => 'useCronUpdates = false',
  'maintenance' => false,
  'updater.secret' => '$2y$10$Tuk2A43JKlrexEOLQMYCxeTsUh6tfxRRRbiONxFvjlOB3JVp2mzFC',
  'theme' => '',
  'loglevel' => 0,

The output of your Apache/nginx/system log in /var/log/____:

error log empty

same here. Anything changed. webgui works fine, desktop clients show error and does not sync. On all systems. Php 7.2, 18.04 ubuntu. 13.0.6. If I restore a checkpoint with 13.0.5 its fine again. Anything required in the reverse proxy config?