Windows 7 W7 Build 7000 X-64 Weird Networking Problem

It seems like you're encountering a networking issue between your Windows 7 64-bit (REDFOX) and Vista Ultimate 64-bit (BLACKDOG) computers. Here are some troubleshooting steps and ideas to help resolve this connectivity problem: 1. Check Network Discovery and File Sharing: - Make sure that network discovery and file sharing are turned on for both computers. - You can find these settings in the Network and Sharing Center under Control Panel. 2. Adjust Advanced Sharing Settings: - In the Advanced Sharing Settings, ensure that network discovery, file and printer sharing, and public folder sharing are enabled. - Also, check the password-protected sharing option to see if it's causing any authentication issues. 3. Workgroup Configuration: - Verify that both computers are part of the same workgroup. You mentioned they are in the same workgroup, but it's worth confirming this setting. 4. Firewall Configuration: - Even though you mentioned that firewalls are off, ensure that any third-party security software or built-in firewalls are not blocking the network connection. 5. Share Permissions: - Check the share permissions on the folders you are trying to access. Make sure that the appropriate permissions are set for the shared folders. 6. Network Credentials: - When prompted for a password when connecting to the share, ensure that the correct credentials are entered. Try using the format ComputerName\Username. 7. Network Troubleshooter: - Run the built-in Windows Network Troubleshooter to see if it can diagnose and repair any network connection issues automatically. 8. Static IP Configuration: - Consider assigning static IP addresses to both computers instead of relying on DHCP to avoid any IP address conflicts. 9. DNS Configuration: - Check the DNS settings on both computers. Sometimes DNS resolution issues can cause connectivity problems. 10. Restart Services: - Restart the "Server" and "Workstation" services on both computers. Given the intermittent nature of the issue, it might be beneficial to systematically go through these steps to isolate the root cause of the problem. Networking issues can be tricky, but with patience and thorough troubleshooting, they can often be resolved. If the problem persists, feel free to provide more details for further assistance. Good luck, and I hope this helps resolve your networking problems!