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On Windows there is no real standard. Fortunately, the US govt. requires that Windows be Posix compliant for their servers. So on Winnt based systems (winnt, win2000, XP), the list of services with the port numbers used is in \winnt\system32\drivers\etc\services, or in \windows\system32\drivers\etc\services.

On Linux the same file is /etc/services. In either case, not all of the listed services are necessarily used on your system, but have been assigned port numbers by the standards body: "The Internet Assigned Number Authority" (IANA - http://www.iana.org/).
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You can go to 65535. But there are ranges that should be avoided. From the IANA site:

The port numbers are divided into three ranges: the Well Known Ports,
the Registered Ports, and the Dynamic and/or Private Ports.

The Well Known Ports are those from 0 through 1023.

The Registered Ports are those from 1024 through 49151

The Dynamic and/or Private Ports are those from 49152 through 65535
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Sesame will default to 20000 and 20001, if the port numbers are not otherwise specified. It is very unlikely that 20002 and 20003 are being used, so you might want to simply continue in that sequence.
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20000 and 20001.


Thanks for clarification !! [/quote]

Please post the exact sequence you are using, i.e.:

sesame -server MyMachine:20025:20026
sesame -client MyMachine:20025:20026

and the exact name of the server-computer.

BTW: Windows does have a services manager, but it neglects to post the port numbers.

I reread your last post closely, my problem was the exact server name, I was thinking the server name was something Sesame used, I forgot that it had to be the name of the computer sesame was located on.

Sorry for distracting you, go back to work on 2.0 

Here is a free generic Port Analyzer that may help.  It shows ports in use, not a list of all ports.

http://www.wilsonc.demon.co.uk/d7portanalyzer.htm