ResolutionSometimes due to Networking problems it is necessary to delete Keyspan Driver from Macintosh.
To do so, please:
1) Keyspan driver names may differ, so first of all find out the driver name: pen Finder -> Applications -> Utilities -> Terminal and copy/paste there
kextstat | grep -i keyspan
Hit Return and you will see something like
2) copy/paste the second command:
sudo mv /System/Library/Extensions/KeyspanNHCI-T.kext/ /System/Library/Extensions/KeyspanNHCI-T.kext.back
Hit Return. You will be asked to enter your password. Please, do (note, you will not see it when typing).
Note: you have to replace the part KeyspanNHCI-T.kext in the command above (step 2) if with the item you get on the step 1.
3) copy/paste the command #3 (hit Return thereafter):
sudo rm /System/Library/Extensions.mkext
and command #4 (Return again):
sudo kextcache -k /System/Library/Extensions
4) Restart Mac OS X