Join a windows domain with SSSD

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Hello everyone,

I have a problem in my Red Hat 7.
I have an AD domain windows already set up, and I have a Red Hat 7.3 machine on which I configured SSSD to join the domain.

The problem is that it is well configured but it works 3/4.

I have the result:

[root @ lpn3e190 ~] # realm discover mydomain
mydomain
type: kerberos
domain name: MYDOMAIN
domain name: MYDOMAIN
configured: member kerberos
server software: active directory
client software: sssd
package required: oddjob
package-required: oddjob-mkhomedir
package required: sssd
package required: adcli
package required: samba-common-tools
connection formats:% U
login-policy: allow-realm-logins

then, 1 minute after I have the result:

[root @ lpn3e190 ~] # realm discover mydomain
mydomain
type: kerberos
domain name: mydomain
domain name: mydomain
configured: no

It works 3 times on 4.

Thanks in advance for your help.