To troubleshoot Confluence startup issues, check your atlassian-confluence.log. Find the ERROR message after your startup and check against the known issues listed below.

Known Issues

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  Unable to connect to Oracle database when starting Confluence
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  Fix 'Not supported by BasicDataSource' Setup or Startup Error
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  Confluence will not start due to ClassNotFoundException: SLF4JBridgeHandler
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  How to disable the content re-migration job on startup
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  Unable to Start Confluence Due to I/O errors during LOB access
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  Confluence not accessible after apparent clean startup in the logs
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  How to delay the directory sync on startup in Confluence
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  Confluence Data Center 9.x does not start with Java 11
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  Plugins are disabled at startup and various timeout errors appear in the logs after startup
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  Confluence does not start due to 'Unable to clean the cache directory' error
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  'Unexpected bytes from remote node' error after upgrading Confluence Data Center to 7.18.1 or later
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  Confluence Does Not Start with 'Detected tables with non-default character encoding/collation' Message
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  Confluence Data Center will not start up because the build number in the Home Directory doesn't match the build number in the Database, after upgrade
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  After Downgrading, Confluence Will No Longer Run
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  Unable to Start Confluence Due to JMX
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  Connections could not be acquired from the underlying database
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  Confluence does not start due to Spring Application context has not been set
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  Synchrony startup fails with "Failed to get mem_unit from sysinfo" error
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  Confluence Does Not Start Due to 'there may be a configuration problem in your confluence.cfg.xml file'
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  Confluence fails to start up after replacing or editing web.xml file
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  Confluence fails to start and throws 'MySQL session isolation level 'REPEATABLE-READ' is no longer supported' error
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  Confluence logs errors: 'This prevents creation of a GUID' due to incorrect host name
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  Unable to Start Confluence Due to Malfunctioning Plugin
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  Unable to start Confluence or some plugins are disabled upon startup
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  Unable to Start Confluence Due to MySQL Driver
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  Confluence is unable to startup due to Marketplace connectivity issues
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  'Illegal character in path' Errors Appear when Running on Windows
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  Confluence Unable to Start Due to Insufficient Access Privileges to Database
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  Unable to start Confluence due to java.net.BindException: Cannot assign requested address
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  Confluence does not start due to 'Error deploying configuration descriptor'
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  The scratchDir specified is unusable
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  Confluence Fails to Start with LuceneException
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  Confluence Does Not Start Due to NullPointerException in FelixOsgiContainerManager
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  Confluence Doesn't Start Due to 'Duplicate plugin found'
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  Unable to Start Confluence after LDAP Integration
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  'ERROR Could not instantiate appender named confluencelog' on Startup
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  Confluence Cannot Start Due to 'Unsupported major.minor version 49.0'
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  Confluence Doesn't Start Due to Whiteboard Plugin
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  Getting message 'Upgrade Failed. Please consult the system logs for details' but didn't attempt upgrade
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  Startup Fails with 'NoSuchBeanDefinitionException' Errors
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  IBM JDK_1.6 prevents starting on Zlinux Suse Sles10
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  Confluence crashes due to insufficient disk space and truncated confluence.cfg.xml file
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  MySQL table is marked as crashed and should be repaired
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  Confluence Takes too Long to Start Due to Class Loading
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  Confluence Fails to Start Due to PuTTY
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  Confluence Fails to Start due to Stopped Oracle's Database Listener
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  Confluence Unable to Start with 'Could not reserve enough space for object heap' Error
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  Confluence crashes on startup after adding Crowd integration jar file into the \lib folder
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  'com.mysql.jdbc.exceptions.MySQLNonTransientConnectionException' when Installing Confluence on MySQL on OS X 10.4 Due to MySQL Networking Configuration
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  Unable to Setup Postgres Due to Incorrect Driver
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  Unable to start Windows Service due to "Failed creating java jvm.dll" "The specified module could not be found"
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  Confluence Does Not Start Due to Windows Firewall
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  Confluence Can't Start and Doesn't Create Logfiles due to CATALINA_HOME Being Set
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  Confluence Startup Referencing a Different Tomcat
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  DB2 on zOS Is Not Supported Until Version 2.8
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  Loading Example Site During Installation Throws NullPointerException
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  Getting 'generate could not read a hi value java.sql.SQLException Invalid object name 'hibernate_unique_key' SQLException Error
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  Confluence fails to start after upgrade due to 'NoSuchBeanDefinitionException'
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  Confluence Fails to Start After Crowd Integration
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  Connecting to MS SQL Database Fails Due to 'Unable to get information from SQL Server' Error
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  Confluence Fails to Start after Upgrade Due to 'Could not load security config 'seraph-config.xml'
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  How to Generate a New confluence.cfg.xml

Known Issues for Windows Service

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  Unable to Configure Confluence to Run as a Service on Tomcat 5
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  Unable to start Confluence Windows service after allocating JVM memory
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  Unable to Install Service on Windows Vista
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  Getting 'The image file tomcat6.exe is valid, but is for a machine type other than the current machine'
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  Confluence Does Not Start Due to Windows Firewall