---
title: Jetty thread settings
description: In IDM 7.5.1 and later, the embedded Jetty web server supports Jetty 12.
component: pingidm
version: 7.5
page_id: pingidm:install-guide:jetty-thread-settings
canonical_url: https://docs.pingidentity.com/pingidm/7.5/install-guide/jetty-thread-settings.html
keywords: ["Installation", "Jetty", "Configuration", "Threads"]
---

# Jetty thread settings

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|   | In IDM 7.5.1 and later, the embedded Jetty web server supports Jetty 12.When serving SSL requests, Jetty 12 checks that the incoming host header matches the server certificate's subject and returns a `400 Bad Request` error on a mismatch. If you're upgrading to IDM 7.5.1 or later, you must ensure your IDM server certificate subject matches the host name used by your deployment.Learn more in [What's new](../release-notes/whats-new.html#jetty-12-support-751). |

To change the Jetty thread pool settings, add the following excerpt to your project's `conf/config.properties` file:

```none
# Jetty maxThreads (default 200)
org.ops4j.pax.web.server.maxThreads=${org.ops4j.pax.web.server.maxThreads}
# Jetty minThreads (default 8)
org.ops4j.pax.web.server.minThreads=${org.ops4j.pax.web.server.minThreads}
# Jetty idle-thread timeout milliseconds (default 60000)
org.ops4j.pax.web.server.idleTimeout=${org.ops4j.pax.web.server.idleTimeout}
```

To override these defaults, set a corresponding `OPENIDM_OPTS` variable when you start IDM. For example:

```
export OPENIDM_OPTS="-Xmx2048m -Xms2048m -Dorg.ops4j.pax.web.server.maxThreads=768" /path/to/openidm/startup.sh
Executing ./startup.sh...
Using OPENIDM_HOME:   /path/to/openidm
Using PROJECT_HOME:   /path/to/openidm
Using OPENIDM_OPTS:   -Xmx2048m -Xms2048m -Dorg.ops4j.pax.web.server.maxThreads=768
Using LOGGING_CONFIG: -Djava.util.logging.config.file=/path/to/openidm/conf/logging.properties
-> OpenIDM version "7.5.2" (revision: unknown)
OpenIDM ready
```

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| - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
|   | You cannot use property substitution to set these properties.You cannot adjust Jetty's thread settings in the `conf/jetty.xml` file. If you uncomment the excerpt of `jetty.xml` that starts with `<!--<Arg name="threadpool">...`, errors display in the IDM log. |