Can't Login on launcher nor minecraft.net only mojang

About like 3 months ago i tried going onto my account for minecraft after re installing it because i never really played it and when i tried longing into it i kept getting fail errors, so i go onto minecraft.net and try there with nothing happening but a error. Then i go onto account.mojang and it worked there  and I've been craving to fix this and play on some servers with friends. Please help.