Filing of gstr 3b

Dear Sir

I have paid our GST for the month of July but when filing with digital signature one msg coming --- open emsigner unable to connect server. I tried several times and same is comming. I downloaded the em signer, i updated google crome/ firefox and added content in google crome and also downloaded java current version but it is not happening. Pls anybody guide me ?  

Regards

Gupta