Are these users locally connecting, or are they coming across VPN or the like?
Some slow connect issues are DNS (or name resolution in general) related, so make sure you have good name resolution first off. If they are coming across VPN, Outlook sends a lot of packets with the Do Not Fragment bit set, and if the packet plus the IPSec overhead exceeds the MTU size, it will reject the packet. In certain circumstances (I can't pin them down entirely), the ICMP reply "Packet needs to be fragmented but DF set." gets dropped, so the client doesn't factor that into the MTU size. ------------------------------------------------------ Roger D. Seielstad - MCSE Sr. Systems Administrator Inovis - Formerly Harbinger and Extricity Atlanta, GA > -----Original Message----- > From: Andrey Fyodorov [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, October 08, 2002 2:11 PM > To: Exchange Discussions > Subject: TCP tuning > > > Hi all. Could anyone here confirm whether this helps? > > http://rdweb.cns.vt.edu/public/notes/win2k-tcpip.htm > > > I am looking at this because some of my customers are > reporting slow Outlook performance despite VERY good Internet > connectivity (high bandwidth, very good traceroutes in both > directions). > > Some customers have to click Retry a couple of times before > Outlook connects to their Exchange server. > > I have tried these settings on a lab server and it is running > fine. However I can't really simluate the real world network > load of the production server in the lab in order to verify > whether these settings made any improvements. > > > > I am also checking these articles that indicate Win2K SP3 may > help in my situation: > http://support.microsoft.com/default.aspx?scid=kb;en-us;Q301337 > http://support.microsoft.com/default.aspx?scid=kb;en-us;Q301117 > > Andrey > > _________________________________________________________________ > List posting FAQ: http://www.swinc.com/resource/exch_faq.htm > Archives: http://www.swynk.com/sitesearch/search.asp > To unsubscribe: mailto:[EMAIL PROTECTED] > Exchange List admin: [EMAIL PROTECTED] > _________________________________________________________________ List posting FAQ: http://www.swinc.com/resource/exch_faq.htm Archives: http://www.swynk.com/sitesearch/search.asp To unsubscribe: mailto:[EMAIL PROTECTED] Exchange List admin: [EMAIL PROTECTED]
