Try --
Method 1: Open a web browser to http://apex and see if ARP can locate your Apex.
or
Method #2 (if on Windows) --
http://support.neptunesystems.com/support/solutions/articles/3000017576-how-to-access-your-classic-dashboard-pc
Reeftronics works well. Been using them for about 2 years. When it timesout from reaching my Apex, it'll email me. Usually in 10 minutes of it timing out.
Or like Ming mentioned, you can try http://uptimerobot.com/ I use it for my servers.
No etching on my 75g C2C tank. Only a sticker or gigantic P-Touch label with my name on the bottom glass (exterior side). My silicone work is immaculate. Not sure what's up with C2C nowadays, it's been 5 years since I bought my tank from them.