thank you for your reply, I followed what you described but still the sites don't work,

Mihail Popa : It didn't work :(

TempaC : we have 3 servers: application server, web server and database server and I have this problem with the web server after having some troubles configuring distributed cache service. and I reran the configuration wizzard several times and it's always the same error that appears

no the error is the only thing that appears and i got this error when expecting the log file : Token Cache: Failed to get token from distributed cache for '0).w|s-1-5-21-3714614052-1110681367-3067802826-1136'.(This is expected during the process warm up or if data cache Initialization is getting done by some other thread).

04/24/2017 10:58:17.78 w3wp.exe (0x1CEC) 0x0050 SharePoint Foundation DistributedCache air4a Monitorable Token Cache: Failed to get token from distributed cache for '0).w|s-1-5-21-3714614052-1110681367-3067802826-1136'.(This is expected during the process warm up or if data cache Initialization is getting done by some other thread). ba15eb9d-49b3-90b7-2d8a-dbda998c7645

i did reser IIS but it still doesn't work, the site collection exists under view all site collections and it's the root site collection, i detached the content database and attached it again and the app pool account have permission on the content database but the same error apeared, checking the ULS code I got this error :