Why won't specific web sites open

Hi,
I cannot access my own website with my main computer. This is hosted by a commercial provider. I can open it and retrieve mail with a G4 laptop, MACBOOK and a PC (Vista) through the same Airport/Switch/Cable modem path.
This just started yesterday. The problem is seen in Safari, Firefox and even a FTP program. When I perform a 'traceroute' in the console I get;
c-24-61-240-130:~ jalfonse$ traceroute www.tri-sysdesigns.com
traceroute: unknown host www.tri-sysdesigns.com
I'm using a broadband cable modem. Every other website I try opens normally. I'm even using the G5 to write this message.
Any Hints???
Thanks
Jim

Hi,
As I opened the Network settings (again) to check the DNS server settings (empty as usual), I noticed that an ID had been inserted in my 'DHCP Client ID' box. It was my computer's ID name. This is not required by my local network or the cable provider. I'm scratching my head as to how the field got filled. I haven't even opened the Network settings in quite a while.
Once I emptied the field, pressed 'Apply Now' I was able to access the website and e-mail from that site. After 10-30 seconds it stopped working again. If I change the location from Automatic to another choice, it starts working again. After 10-30 seconds it again stops.
I opened the Console and viewed the System Logs. I cleaned it and started recording when I changed locations. The connection worked at 16:47:34 (Appletalk startup complete) and stopped at 16:47:42 (mDNSResponder:ERROR...)
Here's the log
Jul 19 16:47:28 JimG5 configd[67]: AppleTalk startup
Jul 19 16:47:28 JimG5 lookupd[2196]: lookupd (version 369.5) starting - Sat Jul 19 16:47:28 2008
Jul 19 16:47:28 JimG5 configd[67]: posting notification com.apple.system.config.network_change
Jul 19 16:47:28 JimG5 configd[67]: setting hostname to "JimG5.local"
Jul 19 16:47:28 JimG5 lookupd[2197]: lookupd (version 369.5) starting - Sat Jul 19 16:47:28 2008
Jul 19 16:47:29 JimG5 webdavd[2143]: stream_transaction: CFStreamError: domain 12, error 7
Jul 19 16:47:29 JimG5 kernel[0]: webdav server: http://idisk.mac.com/jalfonse/: connection is dead
Jul 19 16:47:29 JimG5 KernelEventAgent[62]: tid 00000000 received VQ_DEAD event (32)
Jul 19 16:47:29 JimG5 KernelEventAgent[62]: tid 00000000 type 'webdav', mounted on '/Volumes/jalfonse', from 'http://idisk.mac.com/jalfonse/', dead
Jul 19 16:47:29 JimG5 KernelEventAgent[62]: tid 00000000 found 1 filesystem(s) with problem(s)
Jul 19 16:47:31 JimG5 configd[67]: posting notification com.apple.system.config.network_change
Jul 19 16:47:31 JimG5 lookupd[2202]: lookupd (version 369.5) starting - Sat Jul 19 16:47:31 2008
Jul 19 16:47:31 JimG5 configd[67]: setting hostname to "c-24-61-240-130.hsd1.ma.comcast.net"
Jul 19 16:47:33 JimG5 mDNSResponder: Repeated transitions for interface en0 (24.61.240.130); delaying packets by 5 seconds
Jul 19 16:47:33 JimG5 mDNSResponder: Advertising JimG5. IP 24.61.240.130
Jul 19 16:47:34 JimG5 configd[67]: AppleTalk startup complete
Jul 19 16:47:42 JimG5 mDNSResponder: ERROR: Only name server claiming responsibility for "JimG5." is "."!
Jul 19 16:47:42 JimG5 mDNSResponder: HostnameCallback: Error -65538 for registration of JimG5. IP 24.61.240.130
Jul 19 16:48:01 JimG5 configd[67]: posting notification com.apple.system.config.network_change
Jul 19 16:48:01 JimG5 lookupd[2248]: lookupd (version 369.5) starting - Sat Jul 19 16:48:01 2008
Jul 19 16:48:03 JimG5 mDNSResponder: Advertising JimG5. IP 24.61.240.130
Jul 19 16:48:03 JimG5 mDNSResponder: ERROR: Only name server claiming responsibility for "JimG5." is "."!
Jul 19 16:48:03 JimG5 mDNSResponder: HostnameCallback: Error -65538 for registration of JimG5. IP 24.61.240.130
Sorry for being so long.
Thanks for your help
Jim

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