IE 11 does not like a domain value in the cookie. Leave it empty.
Wrong for IE 11:
Set-Cookie: kohanasession=foobar; expires=Tue, 09-Apr-2016 01:01:01 GMT; path=/; domain=tc.mk; httponly
Correct for IE 11:
Set-Cookie: kohanasession=foobar; expires=Tue, 09-Apr-2016 01:01:01 GMT; path=/; httponly