WiFi rejection problem after Mavericks upgrade I recently upgraded MacBook Pro (Retina, 13-inch, Early 2013) operating system from Mountain Lion to Mavericks. Since then several WiFi networks are rejecting my password (rejecting wrong passwords immediately, and giving timeout for correct ones) or even not showing up in the WiFi list. In the meantime, some other networks are OK.

Is there a post-upgrade task to clean up or reset the Wireless configuration or drivers?

What I've tried:


Removing saved wifi records from Network preferences - Advanced
Removing wifi passwords from Keychain Assistant
Removing Wi-Fi profile from network preferences and recreating it
Changing the Service Order with Wi-Fi to top (under the gear next to +/-)
Unfortunately I often have no access to routers to reboot or change channels
My new MacBook Air was effected by this problem (but the old white MacBook was not).  Here's what I did 2 days ago in System Preferences in this order: renew DHCP Lease, uncheck Keychain in iCloud, and then restart the computer.  So far so good.