Problem loading page,so long period on authentification

hello Ownclouders , i m using owncloud on debian server , with LDap accounts

when I log in the browser , the server is frozen in authentication step ( for long minutes )
than it sends me this error :

(( Problem loading page, reloading in 5 seconds ))

and i cannt do any thing on the owncloud page ,

can you please tell me the possible causes of this error

Hi,

please create a new thread in the "oC server" category and make sure that you're filling out the prefilled template shown there. Currently even the basic information about your environment is missing.