NMC: Unable to set user privileges based on user token for root ->Security token has expired.

Hello everyone,

I have NMC running on a dedicated linux server on 9.1.1.6 and about 60 backupservers connecte with NW 9.1.1.5 and one with 9.2.1.1

between 24 and 48 hours after NMC startup I get the following message every 2 seconds in gstd.log on NMC

nsrd AUTHC critical Unable to set user privileges based on user token for root on : Security token has expired.

gstd.log in debug level=3

gstd NSR notice 04/20/18 09:38:29.547136 lgto_auth: redirected to prog 390103 vers 2

gstd NSR notice 04/20/18 09:38:31.097192 lgto_auth for `nsrmmdbd' failed: Unable to set user privileges based on user token for root on : Security token has expired.

nsrd AUTHC critical Unable to set user privileges based on user token for root on : Security token has expired.

gstd NSR notice 04/20/18 09:38:31.097317 lgto_auth for mmdb connection failed: Unable to set user privileges based on user token for root on : Security token has expired.

; retrying...

gstd NSR notice 04/20/18 09:38:31.097356 build_lgtoauth_parms using override_uname: root

I use LDAPS authentication.

prior to this console I had a windows NMC with local authentication which showed identic messages (only SYSTEM instead of root user)

if I shutdown the named backupserver from the gstd.log the messages are gone.

if I start it up again they come back.

only gstd stop and start solve the issue for 1-2 days, after a NMC restart everything is working very well.

has anyone similar experiences or explanations?

I already searched the knowledge base but could not find a working solution.

maybe 9.2.1.2 and/or 9.1.1.7 might help?

thanks for any answer

Dominic