Even though i specify a port number in my ODBC connection string to a Progress database, I can see that that the actual port# that is used in the TCP connection is different. Can anyone please explain why this is so?
For example, int the connection string
"HOST=myServerAddress;DB=m
the actual port # used might be 2000.
This Question has been solved and asker verified All Experts Exchange premium technology solutions are available to subscription members.
Experts Exchange has been collecting answers to technology questions since 1996…3 million and counting! If you have a question, chances are we already have your answer.
If you can't find the exact answer you're looking for, ask our exclusive community of 50,000 experts. You’ll get a personalized answer from a trusted professional.
Thousands of free tech tips, tricks, how-to’s and tutorials are available in our peer reviewed articles section. See for yourself how smart our experts are, no login required.
Save solutions to your questions, answers you’ve discovered through searching plus helpful articles in your personal knowledgebase for easy future access.
Access the answers to your technology questions today.
30-day free trial. Register in 60 seconds.
Members of the expert community talk about why the experience at Experts Exchange is different than what you will find anywhere else.
Try it out and discover for yourself.
30-day free trial. Register in 60 seconds.
Join the community of experts here and help other tech pros by answering question in your area of expertise. You can earn FREE access to all Experts Exchange's premium features and resources.
Thanks, Casper.
The reason I posted the question is because I'm monitoring ODBC connections created against the Progress database server by my web application. What I'm observing is that for the same connection string, say
"HOST=myServerAddress;DB=m
I can sometimes see two different TCP connections to the database server or broker, say
Local Port#: 3000 Remote Port #: 2000
Local Port#: 3002 Remote Port #: 2000
Can you please explain this?
Client ports are dynamically assigned by the operating system when the 'connect()' system call is
used. Neither the user nor the system administrator has control of what port number ends up being used. The operating system checks to make sure that the used port is currently free.
An explanation for seeing more then 1 localport could be that you are executing a subquery which uses another connection to the database. An _sqlsrv2 proces can handle up to -Ma client conections. (-Ma is the max clients per server parameter).
Casper.
Business Accounts
Answer for Membership
by: progressorPosted on 2009-07-22 at 22:55:16ID: 24922171
The port number in the connection string is the portnumber of the database broker. This broker routes the request to an available server. (_sqlsrv2 proces) , default portrange of SQL (_sqlsrv2) or 4GL (_mporsrv) servers lie between 1025 and 2000. The actual request is handled and sent back by a server proces, not by the database broker.
Casper.