Bug 421117

SUMMARY
Kontact cannot connect to IMAP-Server (posteo.de) to fetch mail or to DAV-Server (fruux.com) to fetch CalDav- or CardDav-Resources. IMAP goes offline in kMail and kontact finishes search for resources without success.

STEPS TO REPRODUCE
1. create clean setup for kontact
2. enter credentials and server settings
3. look for new mails / dav-resources

OBSERVED RESULT
kmail goes offline after a few seconds, kontact finishes without results

EXPECTED RESULT
collect emails with kmail and add dav-resources to kontact

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 19.10, Kernel 5.6.11-050611-generic
KDE Plasma Version: 5.18.3
KDE Frameworks Version: 5.67.0
Qt Version: 5.12.4

ADDITIONAL INFORMATION
Mail provider states that no recent changes were made to the server. Thunderbird fetches both mails and dav-resources just fine on same OS.

---- akonnadictl output ----
christoph@phoenix:~$ Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
org.kde.pim.akonadiserver: Starting up the Akonadi Server...
akonadi.collectionattributetable                   OK
akonadi.collectionmimetyperelation                 OK
akonadi.collectionpimitemrelation                  OK
akonadi.collectiontable                            OK
akonadi.flagtable                                  OK
akonadi.mimetypetable                              OK
akonadi.parttable                                  OK
akonadi.parttypetable                              OK
akonadi.pimitemflagrelation                        OK
akonadi.pimitemtable                               OK
akonadi.pimitemtagrelation                         OK
akonadi.relationtable                              OK
akonadi.relationtypetable                          OK
akonadi.resourcetable                              OK
akonadi.schemaversiontable                         OK
akonadi.tagattributetable                          OK
akonadi.tagremoteidresourcerelationtable           OK
akonadi.tagtable                                   OK
akonadi.tagtypetable                               OK
org.kde.pim.akonadiserver: Running DB initializer
org.kde.pim.akonadiserver: DB initializer done
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c600053f0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c600053f0) identified as "ETMCalendarMonitor - 94608579708192"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60025a50) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60026290) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6002e6f0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6002e6f0) identified as "AgentBaseChangeRecorder - 94913954081216"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60041a90) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60041a90) identified as "AgentBaseChangeRecorder - 94359363051104"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60026290) identified as "AgentBaseChangeRecorder - 93952405507840"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6005c4b0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6005c4b0) identified as "AgentBaseChangeRecorder - 94537611361712"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6006d6a0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60076820) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6007eff0) )
org.kde.pim.akonadiserver: Subscriber "" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60088ac0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6006d6a0) identified as "AgentBaseChangeRecorder - 94061164235776"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60076820) identified as "akonadi_maildispatcher_agent - 94061164229312"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6007eff0) identified as "SpecialCollectionsMonitor - 94061164304352"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6009c3a0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60025a50) identified as "AgentBaseChangeRecorder - 94347327243696"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6009c3a0) identified as "KNotes Session - 94347327154256"
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6009db00) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6009cb10) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6009d390) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6009c900) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6009b180) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6009b180) identified as "AgentBaseChangeRecorder - 94615428713952"
org.kde.pim.akonadiserver: Subscriber "" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c600f36c0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c601097a0) )
org.kde.pim.akonadiserver: Subscriber "" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c600f36c0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c600f36c0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6009c900) identified as "AgentBaseChangeRecorder - 94187515188032"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c600f36c0) identified as "UnifiedMailboxChangeRecorder - 94187515180240"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60107b50) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6009db00) identified as "AgentBaseChangeRecorder - 94688076047312"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c601090b0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c601086b0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c601430e0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6009cb10) identified as "AgentBaseChangeRecorder - 94229608292560"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60107b50) identified as "MailFilterCollectionMonitor - 94229608704000"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c601430e0) identified as "MailFilterItemMonitor - 140434223534928"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c601097a0) identified as "MailFilter Kernel ETM - 94229608365344"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6009d390) identified as "AgentBaseChangeRecorder - 94853941465760"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c601090b0) identified as "Archive Mail Kernel ETM - 94853941547072"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c601086b0) identified as "ArchiveMailCollectionMonitor - 94853941595648"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60188620) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60188620) identified as "SpecialCollectionsMonitor - 140434156600672"
org.kde.pim.akonadiserver: Subscriber "" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6000eb80) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6000eb80) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60187c80) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6016ec30) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6001afd0) )
org.kde.pim.akonadiserver: Subscriber "" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6001afd0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6019a710) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6000e020) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6000eb80) identified as "KMail Kernel ETM - 94500000842768"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60187c80) identified as "SpecialCollectionsMonitor - 94500001259712"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6016ec30) identified as "MessageListTagMonitor - 94500002025472"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6001afd0) identified as "MessageViewerMonitor - 94500001315520"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6001afd0) identified as "MessageViewerMonitor - 94500001315520"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6019a710) identified as "TagActionManagerMonitor - 94500014587504"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6000e020) identified as "FilterManagerTagMonitor - 94500015357872"
Attribute Qt::AA_ShareOpenGLContexts must be set before QCoreApplication is created.
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60203320) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60203320) identified as "AgentBaseChangeRecorder - 94667880906160"
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60214040) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c601773d0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60037ad0) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60214040) identified as "CollectionDialogMonitor - 94667883412512"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c601773d0) identified as "CollectionDialogMonitor - 94667883184160"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60037ad0) identified as "SpecialCollectionsMonitor - 94667882046752"
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.akonadiserver: Subscriber "CollectionDialogMonitor - 94667883184160" disconnected
org.kde.pim.akonadiserver: Subscriber "CollectionDialogMonitor - 94667883412512" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60214040) )
org.kde.pim.akonadiserver: Subscriber "" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6021d440) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6021d440) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6022e9d0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60214400) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c60238110) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60214040) identified as "TagCacheMonitor - 94500093677168"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6021d440) identified as "ETMCalendarMonitor - 94500095441296"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6022e9d0) identified as "TagCacheMonitor - 94500095713232"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60214400) identified as "ItemMonitorMonitor - 94500096230688"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c60238110) identified as "TagCacheMonitor - 94500096789904"
org.kde.pim.akonadiserver.search: Executing search "searchUpdate-1588762077"
org.kde.pim.akonadiserver.search: Search  "searchUpdate-1588762077" done (without remote search)
org.kde.pim.akonadiserver.search: Search update for collection "OpenInvitations" ( 13 ) finished: all results:  0 , removed results: 0
org.kde.pim.akonadiserver.search: Executing search "searchUpdate-1588762077"
org.kde.pim.akonadiserver.search: Search  "searchUpdate-1588762077" done (without remote search)
org.kde.pim.akonadiserver.search: Search update for collection "DeclinedInvitations" ( 14 ) finished: all results:  0 , removed results: 0
org.kde.pim.akonadiserver.search: Executing search "searchUpdate-1588762077"
org.kde.pim.akonadiserver.search: Search  "searchUpdate-1588762077" done (without remote search)
org.kde.pim.akonadiserver.search: Search update for collection "OpenInvitations" ( 13 ) finished: all results:  0 , removed results: 0
org.kde.pim.akonadiserver.search: Executing search "searchUpdate-1588762077"
org.kde.pim.akonadiserver.search: Search  "searchUpdate-1588762077" done (without remote search)
org.kde.pim.akonadiserver.search: Search update for collection "DeclinedInvitations" ( 14 ) finished: all results:  0 , removed results: 0
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6027e5d0) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6027eb30) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c602870f0) )
org.kde.pim.akonadiserver: Subscriber "" disconnected
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6028ff70) )
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c6028ff70) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6027e5d0) identified as "ItemMonitorMonitor - 94500100618816"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6027eb30) identified as "ItemMonitorMonitor - 94500100283904"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c602870f0) identified as "kontact-48271 - 94500100481376"
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c6028ff70) identified as "KAddressBook::GlobalContactSession - 94500100499584"
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c602a3160) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c602a3160) identified as "AgentBaseChangeRecorder - 94486043183328"
org.kde.pim.akonadiserver: Handler exception when handling command FetchCollections on connection akonadi_davgroupware_resource_0 (0x55895022d4d0) : Hierarchical RID does not specify an existing collection
qt.svg: link #rect4138-25-8-1-1 is undefined!
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
QFile::remove: Empty or null file name
org.kde.pim.akonadiagentbase: Impossible to remove  "/home/christoph/.config/akonadi/agent_config_akonadi_davgroupware_resource_0"
org.kde.pim.akonadiserver: Subscriber "AgentBaseChangeRecorder - 94486043183328" disconnected
org.kde.pim.akonadicontrol: Application '/usr/bin/akonadi_davgroupware_resource' exited normally...
org.kde.pim.akonadiserver: New notification connection (registered as Akonadi::Server::NotificationSubscriber(0x7f7c602a3160) )
org.kde.pim.akonadiserver: Subscriber Akonadi::Server::NotificationSubscriber(0x7f7c602a3160) identified as "AgentBaseChangeRecorder - 94104849326064"
org.kde.pim.akonadiserver: Handler exception when handling command FetchCollections on connection akonadi_davgroupware_resource_1 (0x55895022d4d0) : Hierarchical RID does not specify an existing collection
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
org.kde.pim.kimap: Connection to server lost  0
QFile::remove: Empty or null file name