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Found by TC#560608 /CoreOS/tang/Sanity/nagios-plugin-api - basic sanity test of Nagios plugin for Tang server (TJ#3466774). This may be connected with bug 1679186.

Version-Release number of selected component (if applicable):
RHEL-7.7-20190403.0
tang-6-1.el7.s390x
tang-nagios-6-1.el7.s390x

Only on ppc64 and s390x (x86_64 and ppc64le work fine).

Steps to Reproduce: 
    /usr/lib64/nagios/plugins/tang -u http://localhost

Actual results: 
Advertisement contains no exchange keys!

Expected results:
OK|adv=2151 exc=21120 nkeys=2 nsigk=1 nexck=1

The error message in source code: https://github.com/latchset/nagios-tang/blob/master/tang.c#L527

Additional info: this happened only on first run of test. After 'systemctl restart tangd.socket' everything works fine.

*** This bug has been marked as a duplicate of bug 1703445 ***