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Unable to upgrade QFX5100 due to 'jinstall-vjunos fails post-install' error



Article ID: KB31923 KB Last Updated: 13 May 2019Version: 2.0

During an upgrade from Junos 14.1X53-D25, 27, 30 and 40 to any Junos of QFX standalone or virtual chassis, the 'vjunos fails to install' error is seen.


The following error is seen on my device when trying to perform an upgrade on QFX5100:

Error: jinstall-vjunos fails post-install
Error: jinstall-vjunos-14.1X53-D34-domestic-signed fails post-install

This issue occurs if 'tcp-drop-synfin-set' and 'no-tcp-reset drop-tcp-with-syn-only' under Internet-options stanza is configured on the QFX5100 Standalone/Virtual-chassis


Step A:

Check the configuration of the system internet stanza prior to the upgrade:

# show system internet-options
no-tcp-reset drop-tcp-with-syn-only;

# show |display set |match  internet
set system internet-options tcp-drop-synfin-set
set system internet-options no-tcp-reset drop-tcp-with-syn-only

Delete this configuration prior to upgrade:

# delete system internet-options
root# show |compare
[edit system]
  internet-options {
     no-tcp-reset drop-tcp-with-syn-only;
root# commit


After deleting this configuration, perform the upgrade on the Standalone/Virtual-chassis without any failure.

Note: Re-configure system internet stanza again after the upgrade to avoid TCP security attacks.

Step B:

If the above configuration is not available in the switch, please enter the command:
   > request system software add <Junos image > force-host no-validate


Format and install the switch. 
CAUTION: Please take a configuration backup before formatting the switch

Modification History:
2019-05-13: Added alternate Step B
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