I have downgraded my Jira DC instance from 10.3.x (which uses DB password encryption) back to 10.0 (which uses plaintext on dbconfig.xml. When I try to startup the instance I get error below. Jira documentation doesn’t mention this error message.

• I have tried to encrypt the password as per https://confluence.atlassian.com/jiracore/advanced-encryption-975040999.html but this fails.
• I have tried directly adding the JSON object to dbconfig.xml but that didn’t work either

If anyone can point me in the right direction I would greatly appreciate it!

2024-12-26 21:08:30,382-0300 Caesium-1-4 INFO ServiceRunner     [c.a.j.issue.index.DefaultIndexManager] Start to check for index consistency.
2024-12-26 21:08:30,384-0300 Caesium-1-4 WARN ServiceRunner     [c.a.j.issue.index.IndexConsistencyUtils] Index consistency check failed for index 'Issue': expectedCount=65; actualCount=0; tolerancePercentage=10, tolerance=10
2024-12-26 21:08:30,384-0300 Caesium-1-4 INFO ServiceRunner     [c.a.j.issue.index.DefaultIndexManager] Index consistency check finished. indexConsistent: false; timeToCheckIndexConsistency: 1 ms
2024-12-26 21:08:30,384-0300 Caesium-1-4 WARN ServiceRunner     [c.a.jira.servlet.ApplicationStateResolverImpl] The search index is inconsistent. This node will report its status as ERROR. You will find information on how to resolve this problem here: https://jira.atlassian.com/browse/JRASERVER-66970
2024-12-26 21:09:00,016-0300 Caesium-1-2 ERROR anonymous    New issue / add comment [c.a.d.c.p.ciphers.base64.Base64Cipher] Runtime Exception thrown when decrypting: {ATL_SECURED}
java.lang.IllegalArgumentException: Illegal base64 character 7b
    at java.base/java.util.Base64$Decoder.decode0(Base64.java:848)
    at java.base/java.util.Base64$Decoder.decode(Base64.java:566)
    at java.base/java.util.Base64$Decoder.decode(Base64.java:589)
    at com.atlassian.db.config.password.ciphers.base64.Base64Cipher.decodeFromString(Base64Cipher.java:67)
    at com.atlassian.db.config.password.ciphers.base64.Base64Cipher.decrypt(Base64Cipher.java:53)
    at com.atlassian.mail.server.managers.jira.EncryptionManager.decryptPassword(EncryptionManager.java:60)
    at com.atlassian.mail.server.managers.jira.AuthConfigMapper.toConfigurationData(AuthConfigMapper.java:117)
    at com.atlassian.mail.server.managers.jira.OFBizMailServerManager.constructMailServerImpl(OFBizMailServerManager.java:317)
    at com.atlassian.mail.server.managers.jira.OFBizMailServerManager.constructMailServer(OFBizMailServerManager.java:287)
    at com.atlassian.mail.server.managers.jira.OFBizMailServerManager.getMailServer(OFBizMailServerManager.java:131)
    at com.atlassian.jira.service.services.mail.MailFetcherService.getMailServer(MailFetcherService.java:512)
    at com.atlassian.jira.service.services.mail.MailFetcherService.runImpl(MailFetcherService.java:421)
    at com.atlassian.jira.service.services.file.AbstractMessageHandlingService.run(AbstractMessageHandlingService.java:234)
    at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:68)
    at com.atlassian.jira.service.ServiceRunner.runService(ServiceRunner.java:62)
    at com.atlassian.jira.service.ServiceRunner.runServiceId(ServiceRunner.java:44)
    at com.atlassian.jira.service.ServiceRunner.runJob(ServiceRunner.java:32)
    at com.atlassian.scheduler.core.JobLauncher.runJob(JobLauncher.java:134)
    at com.atlassian.scheduler.core.JobLauncher.launchAndBuildResponse(JobLauncher.java:106)
    at com.atlassian.scheduler.core.JobLauncher.launch(JobLauncher.java:90)
    at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.launchJob(CaesiumSchedulerService.java:500)
    at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeClusteredJob(CaesiumSchedulerService.java:495)
    at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeClusteredJobWithRecoveryGuard(CaesiumSchedulerService.java:519)
    at com.atlassian.scheduler.caesium.impl.CaesiumSchedulerService.executeQueuedJob(CaesiumSchedulerService.java:415)
    at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeJob(SchedulerQueueWorker.java:66)
    at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.executeNextJob(SchedulerQueueWorker.java:60)
    at com.atlassian.scheduler.caesium.impl.SchedulerQueueWorker.run(SchedulerQueueWorker.java:35)
    at java.base/java.lang.Thread.run(Thread.java:840)