We are running into issues with BizTalk host instance intermittently going down. One of the things that we are worried about is the number of FTP connections a single host instance is making which could easily reach into the hundreds perhaps sometimes thousands, depending on traffic.
My question is Windows Server 2003 Is there a limit on number of TCP connections per process? If so would putting each application in it's own host instance potentially solve the problem.
There's a lot of other things that are likely to be exhausted before you run out of TCP connections. An FTP server should not crap out for a few thousand connections.
Read this article and the rest of the series. Plus, just do your normal troubleshooting. Anything in the windows System or Application event logs? Is there an application log that you could review? Do the IIS logs tell you anything (assuming IIS is your FTP server)?
There's a lot of things you need to check on before you start guessing that you've run out of TCP connections.
OK - here's a pretty good link for you to start looking into then. That's a lot of new info for me, and I'm still a little surprised that Mark R hasn't delved into it. Of course, it has little to do with kernal data structures except for the TCB, so maybe he doesn't much care :-)
