> Actually, I think that I've found the problem. There appears to be a > firewall between the mainframe and the Windows box. The ftp which is > failing is large (small ftps succeed!) and my estimate is that it is > taking just a bit over 2 minutes to complete the data transfer. I > think the firewall is timing out the ftp control connection due to > "inactivity". I have so informed management. Maybe somebody there can > light a fire under the firewall people to get off their fundament and > actually look at it.
It seems that many firewalls and NAT routers have much too short a timeout for such connections. Even ones that do TCP keepalive are often disconnected. I would say two minutes is way way way too short, though. Maybe 15 minutes is ordinary too short. -- glen ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
