It is possible to connect the ES5 admin panel to ES4. It ends badly.

[daperson1]

If you use the ES5 flash admin client to connect to an ES4 instance (Which I did by accident) then you end up with a seemingly working admin client but with none of the fields populated.
This is bad. Please make it impossible to do this so if I accidentially get the port wrong I don't end up disassembling my ES DB to find out what went wrong.

[tcarr]

I'll create a bug ticket for this situation. Sorry for the confusion.