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just upgraded from 10.2.8. I can't network with my other mac after upgrade. any ideas would be greatly appreciated. thanks.

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Upgrading from 10.2.8 to 10.4.2 can leave stale network settings or expose incompatibilities with third-party network/filtering software. reported no networking after the upgrade; common, practical fixes are a new Network Location and isolating third-party software. 's Location trick is a quick first test. 's note about Virex is relevant: older antivirus/firewall packages have historically interfered with Mac TCP services after OS upgrades.

A concise troubleshooting sequence that worked for many Tiger upgrades:

  • Create a new Network Location: Apple menu -> System Preferences -> Network -> Location -> Edit Locations -> + -> Apply. This forces the system to rebuild interface settings.
  • Boot in Safe Mode (hold Shift at startup) to see if third-party extensions or startup items are the cause.
  • Move the system network preference files (safer than deleting) so the OS can recreate them:
sudo mv /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist ~/Desktop/
sudo mv /Library/Preferences/SystemConfiguration/preferences.plist ~/Desktop/

Then restart. If the link still fails, verify both Macs have IPs on the same subnet and distinct addresses, enable File Sharing in Sharing prefs, temporarily disable any firewalls/antivirus, and test with a direct Ethernet cable to rule out router issues.

Caution: back up any custom settings before removing prefs; PPP/PPPoE or manual configs may need reentry. If Virex or similar software was installed, use the vendor-supplied uninstaller or seek an updated build certified for 10.4.2.

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Member Avatar for yellow

The quick and dirty solution? Try creating a new Location in the Network prefpane.

Member Avatar for R.holledge

just upgraded from 10.2.8. I can't network with my other mac after upgrade. any ideas would be greatly appreciated. thanks.[/QUOTE
You have to get rid of virex! then it should work
R

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