iPhones (at the time of 2G) used to have a major issue, they would not fallback to the secondary DNS if the first failed. ----- Original Message ----- From: "Adam J. Henson (ARC-IO)[PEROT SYSTEMS]" <adam@nasa.gov> To: nanog@nanog.org Sent: Wednesday, 19 May, 2010 11:28:32 PM Subject: AT&T Wireless DNS contact Hi all, Apologies for the spam, but can someone at AT&T Wireless with DNS clue contact me off-list? Our iPhones are receiving intermittent SERVFAILs when querying your DNS servers over 3G. We're trying to go through the support chain but it's getting us nowhere fast. Thanks, Adam Henson Network Engineering NASA Ames Research Center adam@nasa.gov