I use plenty of servers without Kerberos and I never see this. I don't think it's clear that having GSSAPIAuthentication on by default is the problem. I think it's more likely that there is some other cause, and turning GSSAPIAuthentication off is merely a workaround.
I also suspect that reporters have a number of different underlying problems. One of them might be reverse DNS lookups timing out.
I use plenty of servers without Kerberos and I never see this. I don't think it's clear that having GSSAPIAuthentic ation on by default is the problem. I think it's more likely that there is some other cause, and turning GSSAPIAuthentic ation off is merely a workaround.
I also suspect that reporters have a number of different underlying problems. One of them might be reverse DNS lookups timing out.