Why doesn't selenium standalon server start as jenkins user?

Question

ubuntu

There are two users jehord and jenkins
Running tests from the console is done by the nightwatch
command If running from the jehord user, then everything is fine, but if I switch and run the tests from the jenkins user, I get an error

Error retrieving a new session from the selenium server
{ sessionId: null,
  status: 13,
  state: 'unhandled error',
  value: 
   { supportUrl: null,
     screen: null,
     additionalInformation: '\nDriver info: org.openqa.selenium.chrome.ChromeDriver',
     hCode: 1457029,
     buildInformation: 
      { releaseLabel: '2.45.0',
        buildTime: '2015-02-26 23:59:50',
        class: 'org.openqa.selenium.internal.BuildInfo',
        buildRevision: '5017cb8',
        hCode: 13974215 },
     systemInformation: 'System info: host: \'jehord-VirtualBox\', ip: \'127.0.1.1\', os.name: \'Linux\', os.arch: \'i386\', os.version: \'3.13.0-32-generic\', java.version: \'1.7.0_79\'',
     class: 'org.openqa.selenium.WebDriverException',
     cause: null,
     localizedMessage: 'unknown error: Chrome failed to start: exited abnormally\n  (Driver info: chromedriver=2.9.248316,platform=Linux 3.13.0-32-generic x86) (WARNING: The server did not provide any stacktrace information)\nCommand duration or timeout: 60.62 seconds\nBuild info: version: \'2.45.0\', revision: \'5017cb8\', time: \'2015-02-26 23:59:50\'\nSystem info: host: \'jehord-VirtualBox\', ip: \'127.0.1.1\', os.name: \'Linux\', os.arch: \'i386\', os.version: \'3.13.0-32-generic\', java.version: \'1.7.0_79\'\nDriver info: org.openqa.selenium.chrome.ChromeDriver',
     message: 'unknown error: Chrome failed to start: exited abnormally\n  (Driver info: chromedriver=2.9.248316,platform=Linux 3.13.0-32-generic x86) (WARNING: The server did not provide any stacktrace information)\nCommand duration or timeout: 60.62 seconds\nBuild info: version: \'2.45.0\', revision: \'5017cb8\', time: \'2015-02-26 23:59:50\'\nSystem info: host: \'jehord-VirtualBox\', ip: \'127.0.1.1\', os.name: \'Linux\', os.arch: \'i386\', os.version: \'3.13.0-32-generic\', java.version: \'1.7.0_79\'\nDriver info: org.openqa.selenium.chrome.ChromeDriver',
     suppressed: [ [length]: 0 ] },
  class: 'org.openqa.selenium.remote.Response',
  hCode: 24277937 }

Connection refused! Is selenium server started?

What is the problem?