Can't join servers

I cant join my friend's server it says "failed to login: the authentication servers are currently not reachable". I tried restarting my minecraft launcher but its still the same..I also noticed that I could join only cracked servers.I purchased Minecraft legally and wanted to play in my friend's server then the message i wrote above appeared.I downloaded cracked version of Minecraft, Tlauncher before but deleted it soon after i purchased Minecraft.Is this the problem that cause me cant join servers?Below I've attached a photo of the error message.Please help me be able to play on Minecraft servers again.Thank You.