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I'm creating a custom NSS module. I managed to make it work on my local Redhat 7.3 box, configured nsswitch.conf correctly

passwd: files SERVICE
shadow: files SERVICE

and confirmed that both _nss_SERVICE_getpwnam_r and _nss_SERVICE_getspnam_r are called with:

getenv passwd username
getenv shadow username

But after I compiled and installed it on a different box, also RedHat 7.3, only _nss_SERVICE_getspnam_r gets successfully called. I print out logs to make sure that as long as glibc enters the function, there will be a trace, but still can't get _nss_SERVICE_getpwnam_r to work properly. There must be some other configuration that overrides nssswitch.conf isn't there? What could possibly be the reason of this problem?

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It was nscd getting in the way. It also caches the negative calls.

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