auth server at minecraft.net error

auth server at minecraft.net are inaccessible. would u like to play offline

i been trying to play prem minecraft for awhile i can do it on my other pc but when im on my newer one i try login into my account using a tech launcher as i done manny time before but in the recent month it keep pulling that msg up when i click login i can login to mojang and use a crack launcher to play crack server plz help