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Then I'm 100% sure we have a bug. The group shouldn't have the non- posix flag after it was updated.
Can you tell us anything about this group: (Mon Mar 16 16:57:52 2015) [sssd[be[MYDOMAIN.COM]]] [sdap_save_group] (0x1000): Mapping group [Organigramma] objectSID [S-1-5-21-2248061571- 2151176789-1472819363-28039] to unix ID
Is it from the same domain? What type does the group have?
Searching for name "Organigramma", I get three results:
dn: OU=Organigramma,OU=Liste di Distribuzione,DC=mydomain,DC=COM objectClass: top objectClass: organizationalUnit ou: Organigramma distinguishedName: OU=Organigramma,OU=Liste di Distribuzione,DC=mydomain,DC=COM instanceType: 4 whenCreated: 20101126102942.0Z whenChanged: 20140418020006.0Z uSNCreated: 20870 uSNChanged: 67370177 name: Organigramma objectGUID:: c/R2xV8yz0mMukbMaENFBg== objectCategory: CN=Organizational-Unit,CN=Schema,CN=Configuration,DC=MYDOMAIN,DC=COM dSCorePropagationData: 20141218110346.0Z dSCorePropagationData: 20140418020006.0Z dSCorePropagationData: 20140418020005.0Z dSCorePropagationData: 20140417070826.0Z dSCorePropagationData: 16010101000001.0Z
dn: OU=Organigramma,OU=Gruppi,DC=mydomain,DC=COM objectClass: top objectClass: organizationalUnit ou: Organigramma distinguishedName: OU=Organigramma,OU=Gruppi,DC=mydomain,DC=COM instanceType: 4 whenCreated: 20101220130013.0Z whenChanged: 20140418020006.0Z uSNCreated: 21089 uSNChanged: 67370180 name: Organigramma objectGUID:: T4yuIBHylkKkdGf8XBmUDw== objectCategory: CN=Organizational-Unit,CN=Schema,CN=Configuration,DC=MYDOMAIN,DC=COM dSCorePropagationData: 20141218110346.0Z dSCorePropagationData: 20140418020006.0Z dSCorePropagationData: 20140418020005.0Z dSCorePropagationData: 20140417070826.0Z dSCorePropagationData: 16010101000001.0Z
dn: CN=Organigramma,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM objectClass: top objectClass: group cn: Organigramma member: CN=AFLI-Affari Legali ed Istituzionali,OU=Qualita,OU=Gruppi,DC=MYDOMAIN,DC=COM member: CN=Q-AMM-DELEGATO,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM member: CN=DGOP-Direzione Generale Operativa,OU=Qualita,OU=Gruppi,DC=MYDOMAIN,DC=COM member: CN=Area Corporate Development e Investor Relations-Area Corporate D,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM member: CN=CCMG-Area Credit Management Group,OU=Qualita,OU=Gruppi,DC=MYDOMAIN,DC=COM member: CN=INAU-Internal Audit,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM member: CN=CORP-Direzione Generale Commerciale,OU=Qualita,OU=Gruppi,DC=MYDOMAIN,DC=COM member: CN=HRCD-Area HR e Organizzazione,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM member: CN=BANC-Area Istituzioni Finanziarie,OU=Qualita,OU=Gruppi,DC=MYDOMAIN,DC=COM member: CN=AMFC-Area Amministrazione Finanza e Controllo,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM member: CN=Q-DIRETTORI,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM distinguishedName: CN=Organigramma,OU=Qualita,OU=Gruppi,DC=mydomain,DC=COM instanceType: 4 whenCreated: 20150313071410.0Z whenChanged: 20150314030012.0Z uSNCreated: 110805040 uSNChanged: 110852488 name: Organigramma objectGUID:: Pi1+wly0FEGdB/kQRNHWcA== objectSid:: AQUAAAAAAAUVAAAAg7L+hVVaOICjcMlXh20AAA== sAMAccountName: Organigramma sAMAccountType: 268435456 groupType: -2147483646 objectCategory: CN=Group,CN=Schema,CN=Configuration,DC=mydomain,DC=COM dSCorePropagationData: 20150314030012.0Z dSCorePropagationData: 16010101000000.0Z