Your website says to allow 173.248.10.105 , not 173.248.155.105 . Which should I be allowing?
It should be 173.248.155.105, I have fixed it on the website. Please consider using profitability Monitor instead - it will monitor your cgminer much better than just an added CGMiner Service. Profitability Monitor has built-in monitor specifically designed to monitor multiple cgminers at once. It will also allow you to manage pools and devices using cgminer API.
The computer I'm trying to monitor has 2 instances running. Cgminer-nogpu is running balance over 3 pools with all my ASICs, and Cgminer is using my GPUs at middlecoin.com, which automatically switches coins when one becomes more profitable. If I don't need to manage Cgminer, just monitor it, is it still worth it?
I think it still worth it: you will use one window of Profitability Monitor just to keep an eye on all your workers instead of using multiple popups for each instance of cgminer. Profitability Monitor is free and very easy to set up. You can also configure it to switch your ASICs between PPC, FRC, BTC and TRC to give you some extra profits when those coins are more profitable than BTC. For the Scrypt GPUs it can be configured to restart cgminer if hashrate falls below some threshold.