Can't use ECP if one of two Exchange servers disabled

Hello all,

For some reason if my 1st Exchange 2013 server disabled I am not able to use ECP of the 2nd Exchange 2013 server.

If I go https://exchange02/ecp I can see a start up page, but after I put my password and login name all I can see is a HTTP 500 Internal server error Page.

Is it normal?