We are using LDAP for authentication, but now it seems everything is lost.

Did you update the LDAP plugin to the 4.x-compatible version? Otherwise the LDAP plugin got deactivated during the update, but the default Login plugin seems to stay disabled, meaning there is no plugin handling the login.

The MySQL issue seems to be independent to this.

I m not able to login now after the update. Usually in Admin section there's an option to upgrade but i m seeing this error page

Here is the config file

[Plugins]
Plugins[] = "CorePluginsAdmin"
Plugins[] = "CoreAdminHome"
Plugins[] = "CoreHome"
Plugins[] = "WebsiteMeasurable"
Plugins[] = "Diagnostics"
Plugins[] = "CoreVisualizations"
Plugins[] = "Proxy"
Plugins[] = "API"
Plugins[] = "ExamplePlugin"
Plugins[] = "Widgetize"
Plugins[] = "Transitions"
Plugins[] = "LanguagesManager"
Plugins[] = "Actions"
Plugins[] = "Dashboard"
Plugins[] = "MultiSites"
Plugins[] = "Referrers"
Plugins[] = "UserLanguage"
Plugins[] = "DevicesDetection"
Plugins[] = "Goals"
Plugins[] = "Ecommerce"
Plugins[] = "SEO"
Plugins[] = "Events"
Plugins[] = "UserCountry"
Plugins[] = "GeoIp2"
Plugins[] = "VisitsSummary"
Plugins[] = "VisitFrequency"
Plugins[] = "VisitTime"
Plugins[] = "VisitorInterest"
Plugins[] = "ExampleAPI"
Plugins[] = "RssWidget"
Plugins[] = "Feedback"
Plugins[] = "Monolog"
Plugins[] = "UsersManager"
Plugins[] = "SitesManager"
Plugins[] = "Installation"
Plugins[] = "CoreUpdater"
Plugins[] = "CoreConsole"
Plugins[] = "ScheduledReports"
Plugins[] = "UserCountryMap"
Plugins[] = "Live"
Plugins[] = "CustomVariables"
Plugins[] = "PrivacyManager"
Plugins[] = "ImageGraph"
Plugins[] = "Annotations"
Plugins[] = "MobileMessaging"
Plugins[] = "Overlay"
Plugins[] = "SegmentEditor"
Plugins[] = "Insights"
Plugins[] = "Morpheus"
Plugins[] = "Contents"
Plugins[] = "BulkTracking"
Plugins[] = "Resolution"
Plugins[] = "DevicePlugins"
Plugins[] = "Heartbeat"
Plugins[] = "Intl"
Plugins[] = "Marketplace"
Plugins[] = "ProfessionalServices"
Plugins[] = "UserId"
Plugins[] = "CustomPiwikJs"
Plugins[] = "LoginLdap"

[PluginsInstalled]
PluginsInstalled[] = "Diagnostics"
PluginsInstalled[] = "Login"
PluginsInstalled[] = "CoreAdminHome"
PluginsInstalled[] = "UsersManager"
PluginsInstalled[] = "SitesManager"
PluginsInstalled[] = "Installation"
PluginsInstalled[] = "Monolog"
PluginsInstalled[] = "Intl"
PluginsInstalled[] = "CorePluginsAdmin"
PluginsInstalled[] = "CoreHome"
PluginsInstalled[] = "WebsiteMeasurable"
PluginsInstalled[] = "CoreVisualizations"
PluginsInstalled[] = "Proxy"
PluginsInstalled[] = "API"
PluginsInstalled[] = "ExamplePlugin"
PluginsInstalled[] = "Widgetize"
PluginsInstalled[] = "Transitions"
PluginsInstalled[] = "LanguagesManager"
PluginsInstalled[] = "Actions"
PluginsInstalled[] = "Dashboard"
PluginsInstalled[] = "MultiSites"
PluginsInstalled[] = "Referrers"
PluginsInstalled[] = "UserLanguage"
PluginsInstalled[] = "DevicesDetection"
PluginsInstalled[] = "Goals"
PluginsInstalled[] = "Ecommerce"
PluginsInstalled[] = "SEO"
PluginsInstalled[] = "Events"
PluginsInstalled[] = "UserCountry"
PluginsInstalled[] = "GeoIp2"
PluginsInstalled[] = "VisitsSummary"
PluginsInstalled[] = "VisitFrequency"
PluginsInstalled[] = "VisitTime"
PluginsInstalled[] = "VisitorInterest"
PluginsInstalled[] = "ExampleAPI"
PluginsInstalled[] = "RssWidget"
PluginsInstalled[] = "Feedback"
PluginsInstalled[] = "CoreUpdater"
PluginsInstalled[] = "CoreConsole"
PluginsInstalled[] = "ScheduledReports"
PluginsInstalled[] = "UserCountryMap"
PluginsInstalled[] = "Live"
PluginsInstalled[] = "CustomVariables"
PluginsInstalled[] = "PrivacyManager"
PluginsInstalled[] = "ImageGraph"
PluginsInstalled[] = "Annotations"
PluginsInstalled[] = "MobileMessaging"
PluginsInstalled[] = "Overlay"
PluginsInstalled[] = "SegmentEditor"
PluginsInstalled[] = "Insights"
PluginsInstalled[] = "Morpheus"
PluginsInstalled[] = "Contents"
PluginsInstalled[] = "BulkTracking"
PluginsInstalled[] = "Resolution"
PluginsInstalled[] = "DevicePlugins"
PluginsInstalled[] = "Heartbeat"
PluginsInstalled[] = "Marketplace"
PluginsInstalled[] = "ProfessionalServices"
PluginsInstalled[] = "UserId"
PluginsInstalled[] = "CustomPiwikJs"
PluginsInstalled[] = "LoginLdap"

Hi,

The easiest way to fix this is to download the latest version of the LoginLdap plugin (https://plugins.matomo.org/api/2.0/plugins/LoginLdap/download/4.2.2) and unpack it into the plugins/ directory.

Alternativly you could enable the Login plugin in the config file and then login without LDAP.

Facing a new issue now