Hello, We have version 1.3.4 on a server and have an odd, intermittent, problem with looking up a particular record. We have other unbound and bind servers that don't have this problem. eg: [root at a log]# unbound-control flush farnell.com ok [root at a log]# dig uk.farnell.com @localhost ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> uk.farnell.com @localhost ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 60335 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;uk.farnell.com. IN A ;; Query time: 73 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Tue Mar 29 10:20:56 2011 ;; MSG SIZE rcvd: 32 [root at a log]# unbound-host uk.farnell.com -v uk.farnell.com has address 126.96.36.199 (insecure) uk.farnell.com has no IPv6 address (insecure) uk.farnell.com mail is handled by 3 mailcore.theplanet.net. (insecure) uk.farnell.com mail is handled by 2 mail.uk.farnell.com. (insecure) Sometimes the dig uk.farnell.com @localhost works, others it does not. It seems to only be this domain that we have problems with. I suspect there are better ways to diagnose this, or to log more verbose? Have you any suggestions as to what steps I should be taking please? The server, if it helps, is 188.8.131.52. I'd happily upgrade, but would rather find out why this is happening first. Thanks. Andrew.