I'm running Samba 3.0.1 on a Linux 2.6.1 kernel and I'm seeing a problem of the XP client missing an ack, the server having to resend, and then the process repeats. This _ONLY_ happens when touching files in a directory, such as clicking on an icon, then clicking on another one causes this problem. If I drag the file and copy it across, I don't see the problem. Here's a tcpdump trace: 22:03:29.843411 vampire.mydomain.com.microsoft-ds > phantom.mydomain.com.1870: P 7548549:7548867(318) ack 61270 win 5840 (DF) 22:03:29.843835 phantom.mydomain.com.1870 > vampire.mydomain.com.microsoft-ds: P 61270:61538(268) ack 7548867 win 63684 (DF) 22:03:29.883965 vampire.mydomain.com.microsoft-ds > phantom.mydomain.com.1870: . ack 61538 win 5840 (DF) Notice 4 second pause 22:03:33.994546 vampire.mydomain.com.microsoft-ds > phantom.mydomain.com.1870: P 7548867:7548977(110) ack 61538 win 5840 (DF) 22:03:33.995168 phantom.mydomain.com.1870 > vampire.mydomain.com.microsoft-ds: P 61538:61622(84) ack 7548977 win 63574 (DF) 22:03:33.995188 vampire.mydomain.com.microsoft-ds > phantom.mydomain.com.1870: . ack 61622 win 5840 (DF) This identical problem is happening on multiple clients, but it is not happening with the same clients to a Solaris 9 server, just the Linux server. Any thoughts?