Ask HN: Where to go for help in a hardware or networking setup?

I have a project that's pretty much a one man shop on the dev. side (and I'm that man). Whilst I can take care of the software setup, over the past year or so we occasionally get complaints about failing to transmit data over the network, and I don't know where to begin to troubleshoot it beyond saying "Try again, it'll work this time".<p>Is there anywhere I can go to find a freelance specialist in this area, just to at least sit down and see if I haven't made any elementary errors.