3 vista PC can connect to the internet but not to each other

By Sacky ·
3 vista PC can connect to the internet but not to each other
?? on: Today at 04:11:57 PM ??
I have 3 PCs on a network (2 wire modem, router, and switch). All were able to connect to each other and share files with no problems, and now they can connect to the internet but not to each other. Nothing in the physical network (cabling, router settings, etc.) has changed.

PC1 is Vista Home Premium and hosts our Quickbooks and Xactimate network versions and stores our shared files.
PC2 and PC3 are both Vista Business.

All computers have the same users/passwords configured on them. All have network discovery, file sharing, public folder sharing, and printer sharing on and password protected sharing and media sharing off. All have the same workgroup and are set to "private" network. All can access the internet with no problem. All have folders shared.

PC1 can access files and folders on PC2 and PC3 without any issue.

Neither PC2 or PC3 can access PC1 unless they are in safe mode with networking support. I have also tried a "clean boot" using msconfig and neither can connect to PC1. When attempting to connect from the network map I get a log on box. When I enter any correct username or password for the accounts that are the same on both machines, I get "logon unsuccessful..." (Before it would connect without even asking for a username/password since I am logged in using an account that exists on that machine). When I attempt to connect using the previously mapped network drive (which is showing a red x as disconnected) I get a logon prompt as well which says "Unknown username or incorrect password."

I have tried a lot of suggestions that I have found for people having similar issues, including changing the local security settings\local policies\security options\Network Security: LAN Manager Authentication level to "send LM & NTLM - use NTLMv2 session security if negotiated" (done in the registry on the vista home machine).

All 3 PCs have McAfee Security Center installed and I have tried disabling the firewall and McAfee completely with no success.

Any help would be much appreciated. I really need to get everything in working order again.

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All Answers

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Have you tried unplugging

by OH Smeg Moderator In reply to 3 vista PC can connect to ...

The Router/Switch or whatever you actually have there?

Quite often provided that this isn't involved in yesterdays Windows Patches/Hot Fixes power spikes can adversely affect things like Routers/Switches and so on. Not enough to take them out and stop them working but enough to make them behave in a screwy manner.

When that happens all that is required is to remove the power lead from the device allow it to sit there for a few seconds and then plug it back in and allow it to reboot.

If that's not the issue look at yesterdays Patches/Hot Fixes/Updates released by Microsoft.


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Reponse To Answer

by Sacky In reply to Have you tried unplugging

Your advice worked, THANK YOU for you help as my nightmare is over!

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Reponse To Answer

by OH Smeg Moderator In reply to Have you tried unplugging
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Great Catch Col!

by gdburton In reply to 3 vista PC can connect to ...

Well done that man!
Even the most "brainless" of boxes occasionally forget what their job in life is!
And they are very easily overlooked when tackling problem that "must" be workstation related!

Sacky, good problem description too. So many OPs do not provide enough info to help point responders in the right direction. Glad it is all going again, I bet this is one solution you will remember!

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