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4 out of 8 XP PCs cannot connect to SBS 2003 server

Hi,

I'm afraid I already have a thread running on this, but no replies since yesterday and working onsite and getting desperate.

SBS 2003 server, 2Wire ADSL router, 2 network printers and 8 PCs connect to two switches. The server sees four PCs and not the other four and cannot ping them. Nothing obvious in the server event log and all automatic services running.

I stopped and restarted the DNS server service and this brought one back, but two still can't ping the server, and the other reports the destination host unreachable.

I've rebooted the server and the PCs, ran Combofix, Malwarebytes Pro and SEP on two of the PCs, but no infections were found.
 
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mikeabc27
Asked:
mikeabc27
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1 Solution
 
scriven_jCommented:
Is there any pattern?  (for instance all the machines on the same switch as the server working, but all the ones on the other one not?)

Do you have connectivity between the machines?

Please also post the link to your other question.
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scriven_jCommented:
Disable any firewall on the server temporarily whilst testing to ensure that this is not the problem.

Check that the switches are not configures to block ICMP (ping) traffic.
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mikeabc27Author Commented:
No pattern with the switches only the pcs that can ping the server can ping one another.

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mikeabc27Author Commented:
Turned off the antivirus and no firewall running on the server,
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Aaron TomoskyTechnology ConsultantCommented:
What are all their ips? Working and non working. Are they all dhcp?
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scriven_jCommented:
Can you also link to the previous post, so we're not reinventing the wheel!
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scriven_jCommented:
Check that all the network cards are running at the same speed and duplex mode.
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scriven_jCommented:
Are the clients all running the same OS?  Which?
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scriven_jCommented:
What happens if you ping loopback?

Have you tried swapping the cables?
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mikeabc27Author Commented:
OK, getting somewhere now.

Tried changing cables and could ping the server. Can't understand why as both server and firewall connect to same switch but can ping firewall but not server with the old cable.
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scriven_jCommented:
Sounds like you might have some crossover cables or that have got some of the pairs swapped round.  Swap for cables that you know are working and see if that resolves the problems.
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scriven_jCommented:
(including the server and firewall cables)
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mikeabc27Author Commented:
Restarted both switches and bingo. Should have tried this first as I have come across this around two years ago.
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