"previous: Upgrading to 2.4.0":#v2_4_0
+h3. Slurm dispatcher requires configuration update
+
+If you use the Slurm dispatcher (@crunch-dispatch-slurm@) you must add a @Services.DispatchSLURM.InternalURLs@ section to your configuration file, as shown on the "updated install page":{{site.baseurl}}/install/crunch2-slurm/install-dispatch.html.
+
+ h3. New proxy parameters for arvados-controller
+
+ We now recommend disabling nginx proxy caching for arvados-controller, to avoid truncation of large responses.
+
+ In your Nginx configuration file (@/etc/nginx/conf.d/arvados-api-and-controller.conf@), add the following lines to the @location /@ block with @http://controller@ (see "Update nginx configuration":{{site.baseurl}}/install/install-api-server.html#update-nginx for an example) and reload/restart Nginx (@sudo nginx -s reload@).
+
+ <pre>
+ proxy_max_temp_file_size 0;
+ proxy_request_buffering off;
+ proxy_buffering off;
+ proxy_http_version 1.1;
+ </pre>
+
h3. Now recommending Singularity 3.9.9
The compute image "build script":{{site.baseurl}}/install/crunch2-cloud/install-compute-node.html now installs Singularity 3.9.9 instead of 3.7.4. The newer version includes a bugfix that should resolve "intermittent loopback device errors":https://dev.arvados.org/issues/18489 when running containers.