What's this 135/UDP traffic?

[Pierre Belanger]

Hello,

This is a hard one, I've been trying to figure out something since
2 days...

When opening a document which has a link to another document, I see
traffic
from the Windows NT client station going to the Samba server on port
135/UDP. According to Microsoft's web site, port 135 TCP or UDP is
"Location Server"... but the Samba server doesn't listen for traffic
on port 135/UDP. So, the client keeps trying to connect to port 135/UDP
on the Samba server for about 2 minutes and then switches to 135/TCP,
which works better...

Can someone help me figure out how to fix this "timeout" issue?

Here's a snoop of the connection if this can help you understand
the situation.

10.64.33.238 -> alkonost     UDP D=135 S=1066 LEN=88
    alkonost -> 10.64.33.238 ICMP Destination unreachable (UDP port 135
unreachable)
10.64.33.238 -> alkonost     UDP D=135 S=1066 LEN=88
    alkonost -> 10.64.33.238 ICMP Destination unreachable (UDP port 135
unreachable)

About 2 minutes later, the client switches to 135/TCP.

10.64.33.238 -> alkonost     TCP D=135 S=1074 Syn Seq=3472092006 Len=0
Win=8192 Options=<mss 1460>
    alkonost -> 10.64.33.238 TCP D=1074 S=135 Rst Ack=3472092007 Win=0
10.64.33.238 -> alkonost     TCP D=135 S=1074 Syn Seq=3472092006 Len=0
Win=8192 Options=<mss 1460>
    alkonost -> 10.64.33.238 TCP D=1074 S=135 Rst Ack=3472092007 Win=0
10.64.33.238 -> alkonost     TCP D=135 S=1074 Syn Seq=3472092006 Len=0
Win=8192 Options=<mss 1460>
    alkonost -> 10.64.33.238 TCP D=1074 S=135 Rst Ack=3472092007 Win=0
10.64.33.238 -> alkonost     TCP D=135 S=1074 Syn Seq=3472092006 Len=0
Win=8192 Options=<mss 1460>
    alkonost -> 10.64.33.238 TCP D=1074 S=135 Rst Ack=3472092007 Win=0
10.64.33.238 -> alkonost     SMB C Code=0x2e Name=SMBreadX Error=0 
    alkonost -> 10.64.33.238 SMB R Code=0x2e Name=SMBreadX Error=0 
    alkonost -> 10.64.33.238 NBT Type=Unknown Length=1456
    alkonost -> 10.64.33.238 NBT Type=SESSION MESSAGE Length=1235
10.64.33.238 -> alkonost     NBT C port=1035 
10.64.33.238 -> alkonost     SMB C Code=0x2e Name=SMBreadX Error=0 


Thank you very much,
Pierre B.