DNS Problem prevenitng Symantec Remote Install

Greetings Experts,

I was recently attempting to upgrading my Symantec antivirus clients and received an error.  According to the Symantec Knowledge Base (see link below), the problem is often rooted in DNS.  I beleive this to be the case since I can no longer ping any client computers within my network either by HostName or IP address.  Everything on my network seems to be working fine which has got be perplexed.

When I Ping HostName, I get the following...
Pinging HostName.DomainName.Com [192.168.1.12]...Request time out.

When I Ping 192.168.1.12, I get Request time out.

According to my domain controller, DNS, the HostName and address are correct in the forward and reverse lookp zones.  The client computer is ON, firewall diabled, and it is indeed 192.168.1.12.  Clients are XP Pro, Servers are SB2003.  Symantec is 10.2.

I am not an expert with DNS so any help is appreciated.
Thanks!

Here is the Syamntec page I mentioned.
http://entkb.symantec.com/security/resultDisplay.do?gotoLink=533&docType=1000&contextId=65021%3A533.613&clusterName=Fusion&contentId=43c3f876-9c20-43ea-b890-c518f61fab19&responseId=d8af2cbe5ed2bec0%3A1b1fbf4%3A111b28b57ae%3A500&groupId=6&answerGroup=1&score=934&page=http%3A%2F%2Foutput%2Fn2005062312163948.html&result=0&excerpt=You+see+the+error+message+%26quot%3BNo+Network+Provider+accepted+the+given+network+path.%26quot%3B&resultType=5000#
hckyntAsked:
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hckyntAuthor Commented:
I wanted to add that I am able to ping some computers on my network.  Thanks!
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NJComputerNetworksCommented:
If you can't ping by IP address, you have a problem with your network.   This has nothing to do with DNS.  

First, you will have to make sure that you can ping using IP addresses.   If you can not do this, you will have to troubleshoot your network settings, switches, and possibly firewall configuration.

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hckyntAuthor Commented:
Thanks for the comment!  We have a total of 21 client machines hooked to one of two Cisco switches.  I am having problems with machiens connected to both switches.  Of the 21 clients, I can ping by address, ping hostname, and install the Symantec software on 11 of them.  On one client I was unable to ping, I releaed and renewed the IP address.  This did not solve the problem.  Any other ideas?  Thanks!
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NJComputerNetworksCommented:
Can you walk up to the problematic machines and try to ping the server?  Sounds like you have some machines not configured correctly.

I guess you are using DHCP...so walk to the client and see if the TCP/IP settings are correct for the problematic machines...

for example:
"On one client I was unable to ping, I releaed and renewed the IP address."  So, why can't you ping?  Are the TCP/IP not correct?  Or is the Network cable plugged into the wall?  Do you get a link light on the NIC?  Are you getting a DHCP address?  Is your NIC set to Auto detect or 100/full?  

Sounds like you have basic connectivity problems...
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hckyntAuthor Commented:
As ti turns out, it wa a firewall problem.  On the machine I confirmed had the firewall disabled, the user installed their own.  Thanks.
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