why Galaxy huttenhower lab is not working ?

Hi @Ezhil_Arasi

That public server is run by a lab that hosts their own dedicated help forum. Try checking there instead for updates. I see a few topics that seem related to the current issue: The bioBakery help forum

Update: this seems to be the primary post to follow for updates: No access to online LefSe - #5 by Kelsey_Thompson - LEfSe - The bioBakery help forum