# Upgrade Nexus2 to Nexus3 on different servers - Failed Prepare state **URL:** \ **Category:** Sonatype Nexus Repository\ **Created:** [April 20, 2021, 12:42pm UTC](https://community.sonatype.com/t/upgrade-nexus2-to-nexus3-on-different-servers-failed-prepare-state/6359 "2021-04-20T12:42:21Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![toubiVanKenoubi](https://avatars.discourse-cdn.com/v4/letter/t/ccd318/32.png) [@toubiVanKenoubi](https://community.sonatype.com/u/toubiVanKenoubi)\ **Post date:** [April 20, 2021, 12:42pm UTC](https://community.sonatype.com/t/upgrade-nexus2-to-nexus3-on-different-servers-failed-prepare-state/6359/1 "2021-04-20T12:42:21Z")
Hello, I tried to upgrade/migrate from an older nexus 2 installation to nexus 3 and followed the steps in the documentation. First I Upgraded the Nexus2 Instance successfully to the latest Version and is now on: Nexus Repository Manager OSS 2.14.20-02 I installed the docker container for Nexus 3 on another server and tried to Upgrade the repositories and all configuration from the nexus 2 instance. There is always the following Failure. on one specific repository in the “Preparing Step”, i am using the http download transfer type. ![grafik](https://canada1.discourse-cdn.com/flex047/uploads/communitysonatype/original/2X/1/184d2bbf9e8af2b998ffbd122059312cf24ab8b6.png) Anyone experienced similar behavior during an upgrade? The Log from the nexus3 instance: 2021-04-20 12:07:42,825+0000 DEBUG [plan-executor-12-thread-4] admin com.sonatype.nexus.migration.repository.orient.OrientRepositoryPrepareStep - Transitioning: RUNNING → FAILED 2021-04-20 12:07:42,828+0000 WARN [plan-executor-12-thread-4] admin com.sonatype.nexus.migration.repository.orient.OrientRepositoryPrepareStep - Prepare repository for upgrade: central failed **javax.validation.ConstraintViolationException: attributes[negativeCache].timeToLive: must be greater than or equal to 0** at org.sonatype.nexus.repository.manager.internal.RepositoryImpl.validate(RepositoryImpl.java:174) at org.sonatype.nexus.repository.manager.internal.RepositoryManagerImpl.newRepository(RepositoryManagerImpl.java:193) at org.sonatype.nexus.repository.manager.internal.RepositoryManagerImpl.create(RepositoryManagerImpl.java:345) at org.sonatype.nexus.common.stateguard.MethodInvocationAction.run(MethodInvocationAction.java:39) at org.sonatype.nexus.common.stateguard.StateGuard$GuardImpl.run(StateGuard.java:272) at org.sonatype.nexus.common.stateguard.GuardedInterceptor.invoke(GuardedInterceptor.java:54) at org.sonatype.nexus.repository.manager.RepositoryManager$create$4.call(Unknown Source) at com.sonatype.nexus.migration.repository.RepositoryPrepareStep.doRun(RepositoryPrepareStep.groovy:138) at com.sonatype.nexus.migration.plan.Step.run(Step.groovy:271) at com.sonatype.nexus.migration.plan.Step$run$1.call(Unknown Source) at com.sonatype.nexus.migration.plan.StepExecutor.runSync(StepExecutor.groovy:168) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:352) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034) at org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.callCurrent(PogoMetaClassSite.java:68) at org.codehaus.groovy.runtime.callsite.AbstractCallSite.callCurrent(AbstractCallSite.java:169) at com.sonatype.nexus.migration.plan.StepExecutor$\_runAsync\_closure1.doCall(StepExecutor.groovy:197) at com.sonatype.nexus.migration.plan.StepExecutor$\_runAsync\_closure1.doCall(StepExecutor.groovy) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:98) at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325) at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:264) at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1034) at groovy.lang.Closure.call(Closure.java:420) at groovy.lang.Closure.call(Closure.java:414) at groovy.lang.Closure.run(Closure.java:501) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ---
**Author:** ![mmartz](https://avatars.discourse-cdn.com/v4/letter/m/e9bcb4/32.png) [@mmartz](https://community.sonatype.com/u/mmartz)\ **Post date:** [April 20, 2021, 8:29pm UTC](https://community.sonatype.com/t/upgrade-nexus2-to-nexus3-on-different-servers-failed-prepare-state/6359/2 "2021-04-20T20:29:49Z")
Check the configuration of the central proxy in nxrm 2. I’m guessing the Expiration Settings \> Not Found Cache TTL is a negative number and needs to be a positive number (or 0). ---
**Author:** ![toubiVanKenoubi](https://avatars.discourse-cdn.com/v4/letter/t/ccd318/32.png) [@toubiVanKenoubi](https://community.sonatype.com/u/toubiVanKenoubi)\ **Post date:** [April 21, 2021, 6:50am UTC](https://community.sonatype.com/t/upgrade-nexus2-to-nexus3-on-different-servers-failed-prepare-state/6359/3 "2021-04-21T06:50:45Z")
Thanks a lot for this Hint! Worked and is now upgrading 😄