Replacing the cable modem and then the network switch brought the observatory back online. However, a couple of days later, the primary computer finally failed for good.
To be fair, I have been nursing it along for several years now and maybe the recent stress made it finally fail, maybe not. This computer was the one that took the most severe hit on the July 6, 2012 lightning strike. It lost one of the ethernet ports and both of the RS-232 ports. I switched to the other e-net port and installed a RS-232 serial card and pressed on. A couple of years ago it could no longer find the #1 disk, so I had to reconfigure it to use the other disk and pressed on.
Recently though, observing runs have been interrupted by IO errors. So, I ordered replacement computers. The observatory uses two, the first runs the scope and equipment for imaging. The second, runs all the support functions, weather, sky monitor, etc. Both have been running for 12 years and I bought them refurbished. It’s time to let them rest.
The first replacement has arrived and I am in the process of bringing it online. This may take a while.