Issue:
Following update to Apples's OS X from 10.8.x to 10.9.0 or 10.9.1 "Mavericks", applications hang and report time-outs.
Update: OS X 10.9.2 still does NOT fix the issue.
This affects FileZilla, CyberDuck, Citrix remote clients, IBM Notes, Windows XP inside VMware Fusion, Compressor, time-outs and "server no longer available" issues copying files to both Windows (SMB) and Linux (NFS) shares, Streaming issues w/ The Blaze and other on-line streaming providers, "hangs" (also known as my-screen-went- blank) in Firefox and Safari navigating web sites. In other words, everything that communicates with anything else is broken.
For Citrix, we see 3 types of symptons:
- screen freezes
- screen doesn't freeze but keyboard no longer works
- loss connection to server
For IBM Notes, we see two main symptoms:
- lightning bolts hangs w/cannot connect to server time-outs after the time-out specified in the Ports preferences for the client.
- failure to load various windows within Mail and Calendar
For FileZilla, we see issues transfer time-outs every 3 to 10 seconds regardless if transferring small or large files.
For Messaging app:
- w/ video and audio calls, we drop calls
- w/ text messaging, messages sent aren't really sent (received by the other side), or received.
Cause:
The cause is a flaw in Apple's implementation of unicast ARP request handling in redundant pathways, (e.g. Cisco redundant switches or having wireless and lan connections both active), although we also see it with very simple SOHO networks, as well.
Solution:
Open a Terminal window, enter the following commands:
# sudo su
(enter password)
# vi /etc/sysctl.conf
(you may see the new file warning - that's okay)
Add the following and save the file:
net.link.ether.inet.arp_unicast_lim=0
(<esc> wq <enter>)
# chown root:wheel /etc/sysctl.conf
# chmod 0644 /etc/sysctl.conf
Disabling and re-enabling your network connections will not work. You need to save anything open in any other applications, and Reboot your Mac.
# reboot
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