Mac OS X 10.4.9 Special Report: Server connection drops

A number of users are reporting problems with general network transfers after the update to Mac OS X 10.4.9, receiving the error message "Server Disconnected" in the middle of file transfers or experiencing inordinately slow transfers.

This problem generally affects transfers to mounted network volumes. Transfers from from mounted network volumes back to the client Mac are generally successful.

In some cases, these network bottleneck can be resolved by modifying the delayed_ack parameter of Mac OS X's TCP/IP configuration by entering the following command in the Terminal (located in Applications/Utilities):

• sudo sysctl -w net.inet.tcp.delayed_ack=0

then pressing return.

Index:

• Release notes
• Update procedure recommendation
• Common workarounds for when things go wrong post-update
• Downgrading to Mac OS X 10.4.8 (uninstalling Mac OS X 10.4.9)
• Files modified by this update

• AirPort: Loss of connectivity, card not recognized, more
• Application launch problems
• Bluetooth device issues
• Classic: Will not run, other issues
• Desktop icons missing
• Disk images not mounting
• Eject key issues: Longer duration before action takes place
• External optical drives: hardware errors
• Final Cut Pro/Express: Capture issues, performance concerns
• Finder persistently crashes and re-launches
• Frozen windows
• iSync issues/general synchronization problems
• Mail.app: junk filters not working
• Microsoft Office: Various issues
• Networking problems with Mac OS 9 systems
• Persistent booting into Windows
• Printer problems, fixes
• Problems starting up
• Quicken: .Mac backup failure: Fixes
• Resolved issues
• Secure site access broken: fixes
• Segmentation faults
• Server connection drops
• Third-party device issues (Nikon Capture NX, Griffin AirClick, more)
• Update to Final Cut Pro 5.1.4 for best performance
• Volume significantly louder: boon for some, drawback for others
• VPN connectivity issues
• WWAN update included, how to remove

Resources