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XP SP3 DHCP WPAD
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XP SP3 DHCP WPAD - 20.May2008 3:41:39 PM
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rkasbohm
Posts: 1
Joined: 20.May2008
Status: offline
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Our WPAD in our DHCP is no longer working on computers upgrade to XP SP3. Any ideas or having the same problems?
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RE: XP SP3 DHCP WPAD - 22.May2008 1:29:10 PM
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pfitchie
Posts: 13
Joined: 18.Apr.2005
Status: offline
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Hey rkasbohm, I have been battling this same problem for the last few hours and have found a resolution. My environment was as follows: After SP3 the client machines would no longer get DHCP Option 252. After a packet sniff I was able to determine that IE/SP3 was only looking for http://wpad.my.domain/wpad.dat and not the address laided out in DHCP. First however the reason why it is happening as far as I can tell. The behavior for "Automatically Detect Settings" when the XP SP3 box is a domain member with a dns suffix appears to only allow IE to look for wpad.my.activedir.domain and no longer retreive this information from DHCP if available. Also noticed that if the "Automatically Detect Settings" option is pushed via GPO it will not actually be checked if no wpad.my.activedir.domain exists. I may be wrong on this and someone further down the road may answer this better or have an answer to get it to work as previously configured. How I fixed it: Create a DNS (A) Record in your AD DNS Name space called WPAD and pointing to the ip address of the server you previous used to hand out the PAC file. On the server you created the DNS record for make sure wpad.dat is in the root document folder of the web server. In my case I had to rename my PAC file from proxy.js to wpad.dat
And that appears to be it. Now of course if your GPO was pushing a seperate PAC file to different machines then this solution only allows 1 wpad.dat file however you can use the javascript functions with in that file to do checking based on subnet which is what I do to return a different proxy for each physical site.
Patrick
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RE: XP SP3 DHCP WPAD - 2.Jun.2008 3:32:27 AM
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HePa
Posts: 135
Joined: 9.May2008
From: Sweden, Gothenburg
Status: offline
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I would recomend to use DHCP and DNS when using WPAD!
Clients will first try to apply the WPAD settings from DHCP, where from the client get the IP address, gateway, DNS servers, WINS server etc. If the client somehow don't get options from DHCP, having a static IP-adress configured, he then use DNS to query WPAD.
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HePa
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RE: XP SP3 DHCP WPAD - 2.Jun.2008 2:12:09 PM
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pwindell
Posts: 782
Joined: 12.Apr.2004
From: Taylorville, IL
Status: offline
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I'm sure it works either way, but the CNAME just seems to be a "cleaner" DNS configuration to me. :-)
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Phillip Windell
www.wandtv.com
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RE: XP SP3 DHCP WPAD - 2.Jun.2008 2:47:33 PM
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HePa
Posts: 135
Joined: 9.May2008
From: Sweden, Gothenburg
Status: offline
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Yes it should but in all the articles and best practices they refere to a CNAME so it's good to point that out=)!
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HePa
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RE: XP SP3 DHCP WPAD - 21.Aug.2008 4:30:26 PM
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tshinder
Posts: 47490
Joined: 10.Jan.2001
From: Texas
Status: offline
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quote:
ORIGINAL: HePa
Yes it should but in all the articles and best practices they refere to a CNAME so it's good to point that out=)!
Actually, an A record is cleaner and you don't have to worry about compications related to CNAME "stacking"
Tom
_____________________________
Thomas W Shinder, M.D.
Sr. Consultant/Technical Writer
Prowess Consulting http://www.prowessconsulting.com/
Blog: http://blogs.isaserver.org/shinder/
GET THE NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8
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RE: XP SP3 DHCP WPAD - 22.Aug.2008 9:32:13 AM
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tshinder
Posts: 47490
Joined: 10.Jan.2001
From: Texas
Status: offline
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Hi Jason,
Don't you remember years ago when people were having problems with CNAME record stacking and wpad failures?
I know if you don't stack them, you won't run into problems, and CNAME is just a management convenience, but if you don't plan on changing the IP addresses of your A record for the ISA firewall, then CNAME isn't really required.
Tom
_____________________________
Thomas W Shinder, M.D.
Sr. Consultant/Technical Writer
Prowess Consulting http://www.prowessconsulting.com/
Blog: http://blogs.isaserver.org/shinder/
GET THE NEW ISA 2006 Book!: http://tinyurl.com/2gpoo8
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