The war distribution of Nexus is deprecated and we've removed the Nexus war download link from the main download page to discourage it's use. It was originally built as a service to the OSS community, but it receives only basic sanity testing at Sonatype, and we do not devote any significant development resources to it.
Sonatype does not recommend using the Nexus war distribution in production, and does not support it's use. Users should use the Nexus jetty bundle instead. The jetty bundle receives extensive testing via unit, integration, load, and manually run tests every release.
This link can be used to download the war version of Nexus OSS for the remaining Nexus 2.x releases:
When Nexus 3.0 is released there will not be a war version of it.