# Jenkins not starting onTomcat server **URL:** \ **Category:** Using Jenkins\ **Created:** [April 18, 2023, 2:04pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906 "2023-04-18T14:04:59Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![mv8167](https://avatars.discourse-cdn.com/v4/letter/m/7993a0/32.png) [@mv8167](https://community.jenkins.io/u/mv8167)\ **Post date:** [April 18, 2023, 2:04pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/1 "2023-04-18T14:04:59Z")
I installed Jenkins, and it can open using [http://localhost:8080](http://localhost:8080). Io can also start the Tomcat server using localhost:8080. I copied the jenkins.war file into Tomcat’s webapp folder, but when I use the tomcat startup.bat file, and add the Jenkins to the address, localhost:8080/jenkins I get a 404 error. Everything seems correct from my research, but I still can’t get Jenkins to open using the Tomcat server. Any advice to get by this issue? ---
**Author:** ![slide\_o\_mix](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/slide_o_mix/32/20977_2.png) [@slide\_o\_mix](https://community.jenkins.io/u/slide_o_mix)\ **Post date:** [April 18, 2023, 2:47pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/2 "2023-04-18T14:47:58Z")
What version of Jenkins and what version of Tomcat? Jenkins is not compatible with anything above Tomcat 8 I believe. ---
**Author:** ![MarkEWaite](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/markewaite/32/20_2.png) [@MarkEWaite](https://community.jenkins.io/u/MarkEWaite)\ **Post date:** [April 18, 2023, 3:03pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/3 "2023-04-18T15:03:14Z")
Winstone bundled inside Jenkins is the preferred and supported container for Jenkins. It is the most thoroughly tested and includes full support for agents that use Websocket Tomcat 9 generally works though is not tested by any automation or by any of the Jenkins core maintainers. It does not include support for Websocket agents. Tomcat 10 and later are known to not work or have severe limitations. See the servlet container support policy for more details > **[Servlet Container Support Policy](https://www.jenkins.io/doc/administration/requirements/servlet-containers/)** > > Jenkins – an open source automation server which enables developers around the world to reliably build, test, and deploy their software There are some limited instructions on other servlet containers in the [Jenkins user handbook](https://www.jenkins.io/doc/book/installing/servlet-containers/). ---
**Author:** ![slide\_o\_mix](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/slide_o_mix/32/20977_2.png) [@slide\_o\_mix](https://community.jenkins.io/u/slide_o_mix)\ **Post date:** [April 19, 2023, 6:12pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/4 "2023-04-19T18:12:49Z")
My bad, I was thinking it was Tomcat 9, but it is Tomcat 10…thanks for the info. ---
**Author:** ![mv8167](https://avatars.discourse-cdn.com/v4/letter/m/7993a0/32.png) [@mv8167](https://community.jenkins.io/u/mv8167)\ **Post date:** [April 19, 2023, 7:17pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/5 "2023-04-19T19:17:13Z")
Jenkins 2.387.2 for LTS, Tomcat is v10. ---
**Author:** ![mv8167](https://avatars.discourse-cdn.com/v4/letter/m/7993a0/32.png) [@mv8167](https://community.jenkins.io/u/mv8167)\ **Post date:** [April 19, 2023, 7:34pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/6 "2023-04-19T19:34:46Z")
I looked through Tomcat, but v8.5 is being deprecated next year. Will the Native versions suffice? ---
**Author:** ![mv8167](https://avatars.discourse-cdn.com/v4/letter/m/7993a0/32.png) [@mv8167](https://community.jenkins.io/u/mv8167)\ **Post date:** [April 19, 2023, 7:37pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/7 "2023-04-19T19:37:44Z")
> [@MarkEWaite](#): > > Winstone bundled inside Jenkins Can you please fill me in on what this is? Mike ---
**Author:** ![halkeye](https://dub1.discourse-cdn.com/flex013/user_avatar/community.jenkins.io/halkeye/32/8_2.png) [@halkeye](https://community.jenkins.io/u/halkeye)\ **Post date:** [April 19, 2023, 7:49pm UTC](https://community.jenkins.io/t/jenkins-not-starting-ontomcat-server/6906/8 "2023-04-19T19:49:00Z")
Did you read the link mark provided? [https://www.jenkins.io/doc/administration/requirements/servlet-containers/](https://www.jenkins.io/doc/administration/requirements/servlet-containers/) tomcat 10 is not supported and has known issues. No open source contributions have been made to fix things. > [@mv8167](#): > > Can you please fill me in on what this is? essentially [https://winstone.sourceforge.net/](https://winstone.sourceforge.net/) tl;dr `java -jar jenkins.war`