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greetings
drwxr-xr-x@ 14 root wheel 476 May 26 13:07 usr

chmod -Rf 755 /usr
chown -Rf root:wheel /usr

that should set you straight. Then relaunch your apps

As a general rule, never change ownership of a system level directory, and definitely do not change that ownership recursively.

drwxr-xr-x 8 root wheel 272B Mar 8 15:58 local

The...

man -k sharing
InternetSharing(8) - simple NAT/router configuration daemon
threads::shared(3pm) - Perl extension for sharing data structures between threads

man InternetSharing

man...

I'm not sure the router even knows -- it may be waiting for it to time out before it decides it's really gone. There may a message from the disconnecting device before it leaves which airport is...

Skype is an evil little thing when it comes to network security. Since it might be used in very restricted environments it keeps a list of public accessible servers to route calls through, and...

TCP connections do communicate in both directions.

If you're wondering which server initiated the connection(i.e. did you connect to them, or they to you?) you can check the port number. ...