How do I "re-find" an IP address which suddenly "no longer exists"?

I have a GoFlex NAS drive operating on IP addres 192.168.1.65 and a Ucam247 camera which was successfully operating on IP address 192.168.1.66 for a few hours. Then suddenly the camera output stopped recording because the IP address "no longer exists". I read on an earlier discussion the following possible solution but this has not worked:
I think I figured it out. I went into System Preferences\Accounts and checked to see what was loading when I log in. I removed two items related to the external drive software (which never really worked well with the Mac OS anyway) and rebooted. I haven't seen the error since.
Any other thoughts? Thanks

One of my requirements is "Only accept connections from localhost".All you need is to bind to the loopback address:
ss = new ServerSocket(port, 0, InetAddress.getByName("127.0.0.1"));Then it isn't listening at any other IP addresses, so no other host can connect to it: they will get 'connection refused'.
You don't need to check the incoming IP addresses at all.

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