Discuz! System Error

No suitable servers found (`serverSelectionTryOnce` set): [connection closed calling ismaster on 'dds-2ze21d6cfbe78d8433270.mongodb.rds.aliyuncs.com:3717']

PHP Debug

No.FileLineCode
1forum.php173require(%s)
2source/module/forum/forum_group.php2674MongoDB\Collection->updateOne(Array, Array)
3vendor/mongodb/mongodb/src/Collection.php934MongoDB\Driver\Manager->selectServer(%s)
4vendor/mongodb/mongodb/src/Collection.php934break()
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