Do these: 1. make sure your web publishing rule was created using the Exch weirdzard. I've seen manually-created rules cause this sort of behavior 2. make sure your CAS (FE) is responding to all requests properly. The best way to determine this is to examine the IIS logs at the CAS. My RPC/HTTP part 3 blog has several of the more common win32-status error states you'll find for IIS auth problems Jim -----Original Message----- From: isapros-bounce@xxxxxxxxxxxxx [mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Jason Jones Sent: Monday, September 24, 2007 4:41 AM To: isapros@xxxxxxxxxxxxx Subject: [isapros] ActiveSync and ISA FBA (HTML Forms) Hi, Is anyone aware of any problems with ActiveSync when ISA is configured to use FBA with fallback to basic? We have recently moved to a single web listener as part of our Exchange 2007 upgrade and users are now getting intermittent password prompts when ActiveSync tries to authenticate to ISA. If users provide their credentials, the connection is successful. I have also seen the issue at a couple of customers in the past, but assumed it was a device issue. If we go back to a second listener configured for basic authentication only (not HTML forms) users are no longer intermittently prompted and stability is good. Ideally, I would like two listeners, one for OWA/ActiveSync using FBA and one for Outlook Anywhere using Integrated (with KCD). Any sneaky KBs I may have missed?? Cheers in advance... JJ All mail to and from this domain is GFI-scanned.