nexus restlet not downloading index - restlet

Question

When I add http://maven.restlet.org as proxy repository to my nexus repository (version 1.9.2.4), nexus is not able to download the remote indexes.
I see the following error in the nexus log:
org.sonatype.nexus.proxy.ItemNotFoundException: The remoteURL we
requested does not exists on remote server
(remoteUrl="http://maven.restlet.org/.index/nexus-maven-repository-index.gz
Is this a restlet or a nexus problem? How can I use Restlet with Nexus?
The whole stack-trace is:
Cannot fetch remote index for repository "restlet" [id=restlet]
java.io.FileNotFoundException: nexus-maven-repository-index.gz (item
not found)
at org.sonatype.nexus.index.DefaultIndexerManager$2.retrieve(DefaultIndexerManager.java:1114)
at org.apache.maven.index.updater.DefaultIndexUpdater.loadIndexDirectory(DefaultIndexUpdater.java:191)
at org.apache.maven.index.updater.DefaultIndexUpdater.access$300(DefaultIndexUpdater.java:76)
at org.apache.maven.index.updater.DefaultIndexUpdater$LuceneIndexAdaptor.setIndexFile(DefaultIndexUpdater.java:642)
at org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:861)
at org.apache.maven.index.updater.DefaultIndexUpdater.fetchAndUpdateIndex(DefaultIndexUpdater.java:157)
at org.sonatype.nexus.index.DefaultIndexerManager.updateRemoteIndex(DefaultIndexerManager.java:1132)
at org.sonatype.nexus.index.DefaultIndexerManager.downloadRepositoryIndex(DefaultIndexerManager.java:1017)
at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:892)
at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:841)
at org.sonatype.nexus.index.DefaultIndexerManager.reindexRepository(DefaultIndexerManager.java:815)
at org.sonatype.nexus.tasks.ReindexTaskHandlerLegacy.reindexRepository(ReindexTaskHandlerLegacy.java:60)
at org.sonatype.nexus.tasks.AbstractIndexerTask.doRun(AbstractIndexerTask.java:72)
at org.sonatype.nexus.scheduling.AbstractNexusTask.call(AbstractNexusTask.java:159)
at org.sonatype.scheduling.DefaultScheduledTask.call(DefaultScheduledTask.java:437)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(Unknown
Source)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown
Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source) Caused by: org.sonatype.nexus.proxy.ItemNotFoundException: The remoteURL we
requested does not exists on remote server
(remoteUrl="http://maven.restlet.org/.index/nexus-maven-repository-index.gz")
at org.sonatype.nexus.proxy.storage.remote.commonshttpclient.CommonsHttpClientRemoteStorage.retrieveItem(CommonsHttpClientRemoteStorage.java:240)
at org.sonatype.nexus.index.DefaultIndexerManager$2.retrieve(DefaultIndexerManager.java:1097)
... 21 more

Answer 1

You do not need the remote index to use that repository. You won't be able to use the UI to search for artifacts contained in that repository, but Nexus will be able to access artifacts there when directly asked for them (as in "defined as a dependency in a POM").
EDIT: This question is a duplicate of Nexus - proxy repositories with no indexes?.