Hello, It seems in F10 the hostname and DNS domain name are now being added as alias at the end of 127.0.0.1 definition, ala 127.0.0.1 localhost.localdomain localhost f10.domainname.com f10 which unfortunately breaks kerberos in its keytab lookups. Here what's happening in kerberos libkrb5.so.3.3 library (which probably has not changed in while): First the local hostname is looked up: gethostname(localname, MAXHOSTNAMELEN) returns 'f10.domainname.com' [which is correct] Next the IP address is looked up: hints.ai_family = AF_INET; getaddrinfo(localname, 0, &hints, &ai); returns 'ai->ai_addr == 127.0.0.1' [which is kinda correct since 127.0.0.1 is _a_ local address] Finally a reverse DNS lookup is done on the ai_addr (127.0.0.1): getnameinfo(ai->ai_addr, ai->ai_addrlen, ...) returns 'localhost.localdomain' [which is not exactly wrong, but the DNS address of f10.domainname.com is not 127.0.0.1 its a 192.168.x.x address ] Now if I simply remove the 'f10.domainname.com' and 'f10' from the line everything works. If I convert it back to how it was down in F9: 127.0.0.1 f10 localhost.localdomain localhost localhost everything works as well since the DNS lookup will return actual hostname 'f10'. So may questions are: - What was the reasoning behind the re-order? Was it needed to fix something else? - Has anything else been effect this change? If so what was done about it? - Who owns /etc/hosts? rpm -qf /etc/hosts returns "is not owned by any package" tia, steved.