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Installing vCenter Server Appliance 6.0 fails when configuring Single Sign-On with the error: An unexpected error occurred during the installation of the appliance SSO service (2141948)

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  • Installing the vCenter Server Appliance fails when configuring Single Sign-On.
  • You see the error:

    Error: An unexpected error occurred during the installation of the appliance SSO service. Please collect a support bundle and file a service request.

  • In the /var/log/vmware/sso/catalina.log file, you see entries similar to:

    29-Dec-2015 05:40:32.210 SEVERE [main] org.apache.tomcat.util.digester.Digester.fatalError Parse Fatal Error at line 48 column 125: Attribute "sslEnabledProtocols" was already specified for element "Connector". org.xml.sax.SAXParseException; systemId: file:/usr/lib/vmware-sso/conf/server.xml; lineNumber: 48; columnNumber: 125; Attribute "sslEnabledProtocols" was already specified for element "Connector".
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            at org.apache.catalina.startup.Catalina.load(
            at org.apache.catalina.startup.Catalina.start(
            at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
            at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
            at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
            at java.lang.reflect.Method.invoke(Unknown Source)
            at org.apache.catalina.startup.Bootstrap.start(
            at org.apache.catalina.startup.Bootstrap.main(

    Note: This log excerpt is an example. Date, time, and environmental variables may vary depending on your environment.


To resolve this issue, confirm there is not duplicate SSL protocols listed.

  1. Connect to the vCenter Server Appliance and log in using root credentials.
  2. Run this command to enable access the Bash shell:

    shell.set --enabled true

  3. Type shell and press Enter.
  4. Navigate to /usr/lib/vmware-sso/conf/.
  5. Create a backup of the server.xml file.

    cp server.xml server.xml.bak

  6. Open the server.xml using a text editor:

    vi server.xml

  7. Look for multiple instances of sslEnabledProtocols="TLSv1,TLSv1.1,TLSv1.2.

    For example:

    <Connector SSLEnabled="true" sslEnabledProtocols="TLSv1,TLSv1.1,TLSv1.2"

  8. Delete all the instances of sslEnabledProtocols, the resulting file should look like:

    <Connector SSLEnabled="true"

  9. Stop the vpxd service with this command:

    service vmware-vpxd stop

  10. Manually configure Single Sign-On through the vCenter Server Appliance VAMI page (located at https://vcenter_FQDN:5480)
  11. Start the vpxa service with this command:

    service vmware-vpxd start

See Also

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