Forum Thread

IE/Chrome w/ proxy pac file causes huge delays when not going through proxy

StephenMilone 535 41 November 11, 2011 at 01:14 PM
Hi everyone,

having a bit of an odd issue here at my company, let me give you some background.

we have a proxy server and apply IE proxy settings via group policy for everyone to point to a pac file. then within the pac file if your IP lies within a range that our office networks are in, you goto the proxy, otherwise go direct. the pac file is located on one of our file servers.

now my issue lies with 1 computer. With all other hundred or so laptop users this isnt an issue. but for this one person, whenever he tries to connect to the internet outside of the office, it takes about 2 minutes for his homepage (google) to load, after that initial load the internet seems to be okay...here is what i tried so far:

1) IE master reset
2) different domain user on that laptop and that user on a different laptop, the only constant was this laptop is slow to timeout to the proxy.
3) install chrome, same issue, but chrome's status bar says "resolving proxy" during that wait period.

one "dirty" fix we thought of the resolve this is for this person to put the proxy pac file local, so that it doesnt wait the 2 minutes to timeout, but we want to avoid that and i havent tested it yet. ideally i'd like to get some suggestions here, try them, then if it comes down to that nothing else works, we would go this route.

so anyone know any tricks or registry fixes that may resolve this proxy timeout issue?

Cause on all of our other laptops, when outside the office and using the computer, the proxy can't be reached, so it timeouts and it loads the webpage, it seems instant. thank you in advance.

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#2
do the users have an entry for the proxy in their hosts file or is it done by DNS? Same DNS for all etc?

Just guessing
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#3
hosts files are unedited across the board.

everyone is setup for DHCP for all network devices
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#4
You do know that Chrome uses Internet Explorer's Internet Options?
So it should do the same thing for both browsers.

Try using Firefox and see if it does the same thing.

Also, is there a static WINS or DNS entries set up in the TPC/IP properties for the network adapter?
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#5
Quote from djxstream View Post :
hosts files are unedited across the board.

everyone is setup for DHCP for all network devices
have you verified this on the bad box?
Install wireshark on a good box and the bad box and see exactly what it's doing when it's making it's request
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#6
do you have a secondary dns setup for him? Im wondering if his home internet is setup with no dns (as in not from the provider) so when it fails over it its having issues finding out where to get dns records from. a good test would be to test with ping vs just trying to load a webpage as ping has no over head.
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#7
Quote from menace33 View Post :
You do know that Chrome uses Internet Explorer's Internet Options?
So it should do the same thing for both browsers.

Try using Firefox and see if it does the same thing.

Also, is there a static WINS or DNS entries set up in the TPC/IP properties for the network adapter?
Using Firefox or simply turning off the proxy pac setting in IE, works flawlessly. The last thing i want to do is to tell this user to turn off the proxy when outside of the office or add another browser. and nothing is static, double checked yesterday.

Quote from vivahate View Post :
have you verified this on the bad box?
Install wireshark on a good box and the bad box and see exactly what it's doing when it's making it's request
i'll try wireshark, good call.

Quote from mrbobhcrhs View Post :
do you have a secondary dns setup for him? Im wondering if his home internet is setup with no dns (as in not from the provider) so when it fails over it its having issues finding out where to get dns records from. a good test would be to test with ping vs just trying to load a webpage as ping has no over head.
no special DNS setting is on this computer, I checked it all out yesterday on his current computer. We also did a test by bringing a known working computer to his home and it worked fine...as well as testing the problem computer with a verizon aircard in the office, same long timeout happened.

thanks everyone for the suggestions. I'll def try using wireshark and making sure pings are working on monday.
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#8
Ok here is where I would start what happens if someone else logs in or you vblow away his profile, or give him admin rights to the box i would try these before spending a lot of time on stuff.
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#9
Quote from djxstream View Post :
Using Firefox or simply turning off the proxy pac setting in IE, works flawlessly. The last thing i want to do is to tell this user to turn off the proxy when outside of the office or add another browser. and nothing is static, double checked yesterday.
Do a ipconfig /flushdns to clear out DNS cache on that machine.

Also verify whether automatic proxy caching [microsoft.com] is enabled and if so, disable it.
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