voila ce que j'ai dans le log :
[root@serveursmed ~]# tail /var/log/httpd/admin_error_log
[Wed Jan 13 12:22:52 2016] [error] [client 127.0.0.1] Child exited early. at /usr/share/perl5/vendor_perl/esmith/util.pm line 732., referer: https://10.55.5.4/server-manager/cgi-bin/useraccounts?page=3&page_stack=&Next=Next&acctName=cos
[Wed Jan 13 14:03:08 2016] [notice] Graceful restart requested, doing restart
[Wed Jan 13 14:03:08 2016] [notice] Digest: generating secret for digest authentication ...
[Wed Jan 13 14:03:08 2016] [notice] Digest: done
[Wed Jan 13 14:03:08 2016] [notice] Apache/2.2.15 (Unix) mod_auth_tkt/2.1.0 configured -- resuming normal operations
[Thu Jan 14 10:10:35 2016] [error] [client 127.0.0.1] Impossible de d\xc3\xa9terminer l'UID de l'utilisateurcos at /usr/share/perl5/vendor_perl/esmith/FormMagick/Panel/quota.pm line 120., referer: https://10.55.5.4/server-manager/navigation
[Thu Jan 14 10:11:21 2016] [error] [client 127.0.0.1] Failed to set Unix password for account cos: Authentication token manipulation error, referer: https://10.55.5.4/server-manager/cgi-bin/useraccounts?page=3&page_stack=&Next=Next&acctName=cos
[Thu Jan 14 10:11:21 2016] [error] [client 127.0.0.1] Failed to add entry for user cos., referer: https://10.55.5.4/server-manager/cgi-bin/useraccounts?page=3&page_stack=&Next=Next&acctName=cos
[Thu Jan 14 10:11:21 2016] [error] [client 127.0.0.1] Failed to set Samba password for account cos., referer: https://10.55.5.4/server-manager/cgi-bin/useraccounts?page=3&page_stack=&Next=Next&acctName=cos
[Thu Jan 14 10:11:21 2016] [error] [client 127.0.0.1] Child exited early. at /usr/share/perl5/vendor_perl/esmith/util.pm line 732., referer: https://10.55.5.4/server-manager/cgi-bin/useraccounts?page=3&page_stack=&Next=Next&acctName=cos