Yes, if you are attempting to but are unable to during shutdown, you will go through the normal process, but there is a checkbox when you go to submit that you "cannot access my Application Summary today on e-Services".,.... and request temporary access.  In order to allow for your request official documents that will allow temporary efile capability until e-Services is able to be accessed are documentation that is official that have the name, address and EFIN within the last 5 years.  (PTIN registration, EFIN acceptance letters that are older, EFIN status reports with TY17 activity)