OS X 10.11 - Corrupted MAC on input.

If you frequently SSH into network management devices, such as routers and switches, you may notice that in 10.11, it doesn't work anymore. The error message received is: Corrupted MAC on input. ssh_packet_read: message authentication code incorrect.

To get around this, you just need to edit your ssh_config. I'll use nano in this example. 

In terminal, issue:       sudo nano /etc/ssh/ssh_config

Enter your password and hit enter

Scroll down until you see this line: 

#   MACs hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160

Delete the pound sign, which will un-comment that line and make it active.

Hold Control and hit X to exit, hit Y to save, and Enter to apply. 

That should do it!