I have just the regular Serial Data Logger and suspect I may be having this issue as well.  We're running it as a service on a Server 2003 machine.  We have 4 Serial/Ethernet converters (Lantronix) on our system and we're sending the data to a PDF.  It appears that spontaneously the logger stops running one or more of the interaces as a service...when I connect interactively with the application, the data shows up in the application for that interface but not in the PDF file.  I noticed for interfaces running properly, when I connect with the application, it gives a message saying the interface is locked (which makes sense since the service has control), but for the one that is broken I don't get that message.

Would loss of power cause this issue?  I currently don't have Keep Alive enabled, and am planning to do that, but the 2 hour retry timer is unacceptable for our application as well, so I'm curious if a resolution was found on how to modify that time.

Thanks,

Greg Krueger