Exchange OAB download error
Hi, we are publishing Exchange 2010 through an F5 BIG-IP running v11, and we are having problems with users downloading the OAB at specific periods throughout the day. It seems that whenever the OABGen process runs, it updates the oab.xml file, which tells the client which .lzx files to download. However, because of caching on the F5's web acceleration profile, clients are receiving an outdated oab.xml, which still references stale .lzx files. So, when the clients tries to download the .lzx files, they receive 404 errors from IIS. On the client side, the OAB download error we see in Outlook is 0X80190194. It looks like F5 released version 4.8 of the Exchange deployment guide in May, and page 38 has steps required for excluding specific files from being cached to address this issue. However, we've completed these steps and are still having the issue. Is there anything else we need to do in order to complete the fix? Does something else need to be cleared or restarted? The fix was implemented last week, but we're still having issues. If we wait long enough, once the cache expires and the F5 updates its version of oab.xml, the problem goes away until the next day when the OABGen process creates another new oab.xml. We have also isolated this problem to the F5 by using the hosts file on the clients to bypass the F5 and go direct to the CAS when the issue is manifesting itself, and that always works. Thanks in advance for any help that can be provided.