samba - Feb 2005 - How Can I Increase Session Setup Timeout Period - Help!!

I posted the message below, some time ago, and haven't got any suggestions 
yet.  I would be most grateful if anyone could tell me how I can increase the 
timeout period for setting up NETBIOS Sessions for smbclient, as this would 
perhaps solve the problem. By the way, there is no problem when printing from 
any Windows machine.

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I have been trying to use Samba 2.2.6 to permit printing from two SCO 
Openserver 5.0.7 servers (VDOHOM & VDOHOM2) on the WAN consisting of
networks
192.168.1.0, 192.168.11.0 & 192.168.21.0, interconnected by ISDN leased
lines
using CISCO 805 routers.  The network has been up and running for months and 
there are no communications problems. Users have been runing various Oracle 
applications on Win2K servers, connecting to the internet through another 
Win2k server and a firewall, and connecting to the Unix servers with Telnet.

I installed and configured Samba to print to printers attached to the WIN 2003 
Servers JUMBOSRV1 & MSTSVR on 192.168.11.200 & 192.168.21.200
respectively,
using smbprint.sysv.  All Samba parameters are at default value. The WIN 2000 
Server (W2k-SVR, 192.168.1.1) is the PDC & WINS Server for the entire
domain,
consisting of all three LANS.  Printing from any Windows workstation to any of 
teh printers functions correctly.

I have created a user called samba on the two Openserver machines as well as 
on the Windows Domain.  The user was added with with useradd & smbpasswd.  I
do not have any problem accessing or browsing test shares on the UNIX machines.

I am currently trying to set up the printing from the UNIX servers to the WIN 
2003 Server jumbosvr1.  I intend to set up a similar print facility on mstsvr 
after this.

My problem is this.  Some of the time, I can print from either Unix server 
without any problems at all.  However, about half the time, lpstat claims the 
document has been printed, but nothing in fact is printed.  The Win 2003 
servers do not show any queued documents.

When a document prints correctly the arguments (passed by lp -d jumbo -ob 
filename) to smbrpint.sysv (redirected to a log file) are:

Arguments = jumbo-37777 root  1  b /SPARE/APPLICATION/LOCATIONS/invt/mkt/x 

And the smbclient message (I have redirected output to a log file) is:

added interface ip=192.168.1.122 bcast=192.168.1.255 nmask=255.255.255.0
Domain=[DOMAIN] OS=[Windows Server 2003 3790] Server=[Windows Server 2003 5.2]
smb: \> CR/LF<->LF and print text translation now on
smb: \> putting file - as stdin-27268 (14.1 kb/s) (average 14.1 kb/s)


When a document fails to print, smbclient produces the arguments passed to 
smbprint.sysv are:

Arguments = jumbo-38110 root  1  
b /SPARE/APPLICATION/LOCATIONS/invt/mkt/1S20050213455463

Output from smbclient:

added interface ip=192.168.1.122 bcast=192.168.1.255 nmask=255.255.255.0
session setup failed: Call timed out: server did not respond after 20000 
milliseconds

My reasoning so far is this:

1.	Since I can print half the time, there is nothing wrong with the 
networking or name resolution.

2.	Since I can print some of the time SMB printing is set up correctly.

What could cause the session setup to fail sometimes?  Can you suggest 
possible causes and remedies please?  Will my increasing the time out period 
help? How can I do this?

Tks & Rgds,

Joseph Carri