Moises,
You need to update the Krb5.ini, add TWO line (high-lighted)
[libdefaults]
default_realm = DOMAIN.COM
dns_lookup_kdc = true
dns_lookup_realm = true
default_tgs_enctypes = rc4-hmac
default_tkt_enctypes = rc4-hmac
udp_preference_limit = 1
[realms]
SAICOM.NET = {
kdc = DC.DOMAIN.COM
kdc = DC.SAICOM.NET
default_domain = DOMAIN.COM
}
Also see link to KB with many several KB articles about issues with XI 3.1 POST SP3.
http://service.sap.com/sap/support/notes/1261835
Regards,
Ajay