Cannot log into ownCloud Server when one of the LDAP Servers written in the wizard have a wrong credentials

Steps to reproduce

1. As admin enable LDAP app
2. In LDAP section enable two LDAP configurations
3. Make one of the LDAP server backend not accesible changing the data written in the LDAP wizard with a wrong one
4. Try to log in with a user from the other LDAP Server (aaliyah_beer in this case)

Expected behaviour

The users that belongs to the other LDAP server should be able to log in

Actual behaviour

No user can log into the oC server. Error is shown

Server configuration

Operating system:
Ubuntu 16.04

Web server:
Apache

Database:
MySQL

PHP version:
5.6

ownCloud version:

"9.1.3.1","versionstring":"9.1.3","edition":"Enterprise"

Updated from an older ownCloud or fresh install:
Fresh

Are you using external storage, if yes which one: local/smb/sftp/...
No

Are you using encryption:
No

Logs

{"reqId":"xMpur2mMXjlbv0OwSgkL","remoteAddr":"82.159.139.58","app":"no app in context","message":"Exception: {\"Exception\":\"OC\\\\ServerNotAvailableException\",\"Message\":\"Lost connection to LDAP server.\",\"Code\":0,\"Trace\":\"#0 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/LDAP.php(257): OCA\\\\User_LDAP\\\\LDAP->postFunctionCall()\\n#1 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/LDAP.php(43): OCA\\\\User_LDAP\\\\LDAP->invokeLDAPMethod('bind', Resource id #90, 'cn=admin,dc=own...', 'owncloud123')\\n#2 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(600): OCA\\\\User_LDAP\\\\LDAP->bind(Resource id #90, 'cn=admin,dc=own...', 'owncloud123')\\n#3 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(527): OCA\\\\User_LDAP\\\\Connection->bind()\\n#4 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(158): OCA\\\\User_LDAP\\\\Connection->establishConnection()\\n#5 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(166): OCA\\\\User_LDAP\\\\Connection->init()\\n#6 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Access.php(158): OCA\\\\User_LDAP\\\\Connection->getConnectionResource()\\n#7 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_LDAP.php(219): OCA\\\\User_LDAP\\\\Access->readAttribute('uid=aaliyah_bee...', '', '(&(|(objectclas...')\\n#8 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_LDAP.php(274): OCA\\\\User_LDAP\\\\User_LDAP->userExistsOnLDAP(Object(OCA\\\\User_LDAP\\\\User\\\\User))\\n#9 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_LDAP.php(323): OCA\\\\User_LDAP\\\\User_LDAP->userExists('aaliyah_beer')\\n#10 [internal function]: OCA\\\\User_LDAP\\\\User_LDAP->getHome('aaliyah_beer')\\n#11 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_Proxy.php(67): call_user_func_array(Array, Array)\\n#12 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Proxy.php(139): OCA\\\\User_LDAP\\\\User_Proxy->walkBackends('aaliyah_beer', 'getHome', Array)\\n#13 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_Proxy.php(202): OCA\\\\User_LDAP\\\\Proxy->handleRequest('aaliyah_beer', 'getHome', Array)\\n#14 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/User\\\/User.php(251): OCA\\\\User_LDAP\\\\User_Proxy->getHome('aaliyah_beer')\\n#15 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Mount\\\/LocalHomeMountProvider.php(41): OC\\\\User\\\\User->getHome()\\n#16 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Config\\\/MountProviderCollection.php(97): OC\\\\Files\\\\Mount\\\\LocalHomeMountProvider->getHomeMountForUser(Object(OC\\\\User\\\\User), Object(OC\\\\Files\\\\Storage\\\\StorageFactory))\\n#17 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Filesystem.php(435): OC\\\\Files\\\\Config\\\\MountProviderCollection->getHomeMountForUser(Object(OC\\\\User\\\\User))\\n#18 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Filesystem.php(373): OC\\\\Files\\\\Filesystem::initMountPoints('aaliyah_beer')\\n#19 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/util.php(231): OC\\\\Files\\\\Filesystem::init('aaliyah_beer', '\\\/aaliyah_beer\\\/f...')\\n#20 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/FilesystemHelper.php(44): OC_Util::setupFS('aaliyah_beer')\\n#21 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User\\\/User.php(519): OCA\\\\User_LDAP\\\\FilesystemHelper->setup('aaliyah_beer')\\n#22 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User\\\/User.php(499): OCA\\\\User_LDAP\\\\User\\\\User->setOwnCloudAvatar()\\n#23 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User\\\/User.php(481): OCA\\\\User_LDAP\\\\User\\\\User->updateAvatar()\\n#24 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/hook.php(105): OCA\\\\User_LDAP\\\\User\\\\User->updateAvatarPostLogin(Array)\\n#25 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Server.php(268): OC_Hook::emit('OC_User', 'post_login', Array)\\n#26 [internal function]: OC\\\\Server->OC\\\\{closure}(Object(OC\\\\User\\\\User), 'secret')\\n#27 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Hooks\\\/EmitterTrait.php(98): call_user_func_array(Object(Closure), Array)\\n#28 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Hooks\\\/PublicEmitter.php(32): OC\\\\Hooks\\\\BasicEmitter->emit('\\\\\\\\OC\\\\\\\\User', 'postLogin', Array)\\n#29 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/User\\\/Session.php(439): OC\\\\Hooks\\\\PublicEmitter->emit('\\\\\\\\OC\\\\\\\\User', 'postLogin', Array)\\n#30 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/User\\\/Session.php(287): OC\\\\User\\\\Session->loginWithPassword(*** sensitive parameters replaced ***)\\n#31 \\\/opt\\\/owncloud\\\/core\\\/Controller\\\/LoginController.php(196): OC\\\\User\\\\Session->login(*** sensitive parameters replaced ***)\\n#32 [internal function]: OC\\\\Core\\\\Controller\\\\LoginController->tryLogin(*** sensitive parameters replaced ***)\\n#33 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Http\\\/Dispatcher.php(159): call_user_func_array(Array, Array)\\n#34 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Http\\\/Dispatcher.php(89): OC\\\\AppFramework\\\\Http\\\\Dispatcher->executeController(Object(OC\\\\Core\\\\Controller\\\\LoginController), 'tryLogin')\\n#35 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/App.php(99): OC\\\\AppFramework\\\\Http\\\\Dispatcher->dispatch(Object(OC\\\\Core\\\\Controller\\\\LoginController), 'tryLogin')\\n#36 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Routing\\\/RouteActionHandler.php(46): OC\\\\AppFramework\\\\App::main('LoginController', 'tryLogin', Object(OC\\\\AppFramework\\\\DependencyInjection\\\\DIContainer), Array)\\n#37 [internal function]: OC\\\\AppFramework\\\\Routing\\\\RouteActionHandler->__invoke(Array)\\n#38 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Route\\\/Router.php(280): call_user_func(Object(OC\\\\AppFramework\\\\Routing\\\\RouteActionHandler), Array)\\n#39 \\\/opt\\\/owncloud\\\/lib\\\/base.php(891): OC\\\\Route\\\\Router->match('\\\/login')\\n#40 \\\/opt\\\/owncloud\\\/index.php(54): OC::handleRequest()\\n#41 {main}\",\"File\":\"\\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/LDAP.php\",\"Line\":284}","level":3,"time":"2017-02-10T13:16:12+00:00","method":"POST","url":"\/index.php\/login","user":"aaliyah_beer"}
{"reqId":"xMpur2mMXjlbv0OwSgkL","remoteAddr":"82.159.139.58","app":"index","message":"Exception: {\"Exception\":\"OC\\\\ServerNotAvailableException\",\"Message\":\"Lost connection to LDAP server.\",\"Code\":0,\"Trace\":\"#0 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/LDAP.php(257): OCA\\\\User_LDAP\\\\LDAP->postFunctionCall()\\n#1 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/LDAP.php(43): OCA\\\\User_LDAP\\\\LDAP->invokeLDAPMethod('bind', Resource id #90, 'cn=admin,dc=own...', 'owncloud123')\\n#2 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(600): OCA\\\\User_LDAP\\\\LDAP->bind(Resource id #90, 'cn=admin,dc=own...', 'owncloud123')\\n#3 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(527): OCA\\\\User_LDAP\\\\Connection->bind()\\n#4 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(158): OCA\\\\User_LDAP\\\\Connection->establishConnection()\\n#5 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Connection.php(166): OCA\\\\User_LDAP\\\\Connection->init()\\n#6 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Access.php(158): OCA\\\\User_LDAP\\\\Connection->getConnectionResource()\\n#7 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_LDAP.php(219): OCA\\\\User_LDAP\\\\Access->readAttribute('uid=aaliyah_bee...', '', '(&(|(objectclas...')\\n#8 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_LDAP.php(274): OCA\\\\User_LDAP\\\\User_LDAP->userExistsOnLDAP(Object(OCA\\\\User_LDAP\\\\User\\\\User))\\n#9 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_LDAP.php(323): OCA\\\\User_LDAP\\\\User_LDAP->userExists('aaliyah_beer')\\n#10 [internal function]: OCA\\\\User_LDAP\\\\User_LDAP->getHome('aaliyah_beer')\\n#11 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_Proxy.php(67): call_user_func_array(Array, Array)\\n#12 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/Proxy.php(139): OCA\\\\User_LDAP\\\\User_Proxy->walkBackends('aaliyah_beer', 'getHome', Array)\\n#13 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User_Proxy.php(202): OCA\\\\User_LDAP\\\\Proxy->handleRequest('aaliyah_beer', 'getHome', Array)\\n#14 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/User\\\/User.php(251): OCA\\\\User_LDAP\\\\User_Proxy->getHome('aaliyah_beer')\\n#15 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Mount\\\/LocalHomeMountProvider.php(41): OC\\\\User\\\\User->getHome()\\n#16 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Config\\\/MountProviderCollection.php(97): OC\\\\Files\\\\Mount\\\\LocalHomeMountProvider->getHomeMountForUser(Object(OC\\\\User\\\\User), Object(OC\\\\Files\\\\Storage\\\\StorageFactory))\\n#17 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Filesystem.php(435): OC\\\\Files\\\\Config\\\\MountProviderCollection->getHomeMountForUser(Object(OC\\\\User\\\\User))\\n#18 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Files\\\/Filesystem.php(373): OC\\\\Files\\\\Filesystem::initMountPoints('aaliyah_beer')\\n#19 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/util.php(231): OC\\\\Files\\\\Filesystem::init('aaliyah_beer', '\\\/aaliyah_beer\\\/f...')\\n#20 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/FilesystemHelper.php(44): OC_Util::setupFS('aaliyah_beer')\\n#21 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User\\\/User.php(519): OCA\\\\User_LDAP\\\\FilesystemHelper->setup('aaliyah_beer')\\n#22 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User\\\/User.php(499): OCA\\\\User_LDAP\\\\User\\\\User->setOwnCloudAvatar()\\n#23 \\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/User\\\/User.php(481): OCA\\\\User_LDAP\\\\User\\\\User->updateAvatar()\\n#24 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/hook.php(105): OCA\\\\User_LDAP\\\\User\\\\User->updateAvatarPostLogin(Array)\\n#25 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Server.php(268): OC_Hook::emit('OC_User', 'post_login', Array)\\n#26 [internal function]: OC\\\\Server->OC\\\\{closure}(Object(OC\\\\User\\\\User), 'secret')\\n#27 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Hooks\\\/EmitterTrait.php(98): call_user_func_array(Object(Closure), Array)\\n#28 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Hooks\\\/PublicEmitter.php(32): OC\\\\Hooks\\\\BasicEmitter->emit('\\\\\\\\OC\\\\\\\\User', 'postLogin', Array)\\n#29 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/User\\\/Session.php(439): OC\\\\Hooks\\\\PublicEmitter->emit('\\\\\\\\OC\\\\\\\\User', 'postLogin', Array)\\n#30 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/User\\\/Session.php(287): OC\\\\User\\\\Session->loginWithPassword(*** sensitive parameters replaced ***)\\n#31 \\\/opt\\\/owncloud\\\/core\\\/Controller\\\/LoginController.php(196): OC\\\\User\\\\Session->login(*** sensitive parameters replaced ***)\\n#32 [internal function]: OC\\\\Core\\\\Controller\\\\LoginController->tryLogin(*** sensitive parameters replaced ***)\\n#33 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Http\\\/Dispatcher.php(159): call_user_func_array(Array, Array)\\n#34 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Http\\\/Dispatcher.php(89): OC\\\\AppFramework\\\\Http\\\\Dispatcher->executeController(Object(OC\\\\Core\\\\Controller\\\\LoginController), 'tryLogin')\\n#35 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/App.php(99): OC\\\\AppFramework\\\\Http\\\\Dispatcher->dispatch(Object(OC\\\\Core\\\\Controller\\\\LoginController), 'tryLogin')\\n#36 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/AppFramework\\\/Routing\\\/RouteActionHandler.php(46): OC\\\\AppFramework\\\\App::main('LoginController', 'tryLogin', Object(OC\\\\AppFramework\\\\DependencyInjection\\\\DIContainer), Array)\\n#37 [internal function]: OC\\\\AppFramework\\\\Routing\\\\RouteActionHandler->__invoke(Array)\\n#38 \\\/opt\\\/owncloud\\\/lib\\\/private\\\/Route\\\/Router.php(280): call_user_func(Object(OC\\\\AppFramework\\\\Routing\\\\RouteActionHandler), Array)\\n#39 \\\/opt\\\/owncloud\\\/lib\\\/base.php(891): OC\\\\Route\\\\Router->match('\\\/login')\\n#40 \\\/opt\\\/owncloud\\\/index.php(54): OC::handleRequest()\\n#41 {main}\",\"File\":\"\\\/opt\\\/owncloud\\\/apps\\\/user_ldap\\\/lib\\\/LDAP.php\",\"Line\":284}","level":3,"time":"2017-02-10T13:16:12+00:00","method":"POST","url":"\/index.php\/login","user":"aaliyah_beer"}

Client configuration

browser

Mozilla

@jvillafanez

Start with apps/user_ldap/lib/LDAP.php and follow the failing bind through Connection.php, Access.php, User_LDAP.php, and User_Proxy.php. Reproduce the two-configuration case with one invalid LDAP credential and one valid server. Done means users from the reachable LDAP server can log in despite the other backend being unavailable.