Hi all, I've installed OTRS 2.4.7 on my Windows XP laptop. I've configured my OTRS installation to authenticate customers both on OTRS database and our internal company LDAP, setting configuration in Kernel/Config/Defaults.pm following instruction on administration manual (page 114 on pdf) and http://faq.otrs.org/otrs/public.pl?Action=PublicFAQ&ItemID=219 (customizing it for customers instead of agents). Agents instead autyhenticate themself only on OTRS internal database. I can login using local OTRS db account and using LDAP account, but now customers cannot create an account: OTRS fails with a web page containing the message: Can't use an undefined value as a HASH reference at C:/Programmi/OTRS/OTRS/bin/cgi-bin/../../Kernel/System/Web/InterfaceCustomer.pm line 555, <DATA> line 275. In C:\Programmi\OTRS\OTRS\var\log\otrs.log there is no other information. I guess there is some ambiguity in Perl code but I cannot find it? Or maybe I did something wrong with my configuration. What should I check to solve this problem? Thanks for your response Daniele Gagliardi