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.