Issue metadata
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ERR_PROXY_CONNECTION_FAILED
Reported by
will.mcd...@googlemail.com,
Jul 27
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Issue descriptionUserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36 Steps to reproduce the problem: 1. Unable to reproduce error; it happens randomly 2. 3. What is the expected behavior? Users to be able to access internet without 'ERR_PROXY_CONNECTION_FAILED' error. What went wrong? We use a proxy server (Smoothwall) to route our users internet access. We've deployed Chrome GPO templates to set Chrome to look at system setting for proxy details - the system is set to 'automatically detect'. Since Chrome 66 we've had a problem where Chrome will show 'ERR_PROXY_CONNECTION_FAILED' message. Other browsers like Edge, Internet Explorer and Firefox work without issue. Oddly, if a new tab is opened within Chrome that will work, but the tab with 'ERR_PROXY_CONNECTION_FAILED' message will not load no matter how often you try to refresh it. You can actually copy and paste the URL into a new tab and it works. I've since changed the Chrome GPO to declare the location of the .pac file - we still see this error. Did this work before? Yes 64 / 65 Chrome version: 67.0.3396.99 Channel: stable OS Version: 10.0 Flash Version: We're currently starting our Windows 10 project around 2400 users. We intend to set Chrome as the default browser but this error is making us worry!
,
Jul 30
To add to comment #1's instructions: While a capture is in progress, please also click the "Re-apply Settings" button on chrome://net-internals/#proxy and then try to reproduce the issue again to see if things change.
,
Jul 31
I reviewed the Chrome network log after the issue occurred.
I noticed it was failing to resolve WPAD in DNS:
t= 2 [st= 0] +HOST_RESOLVER_IMPL_JOB [dt=2256]
--> host = "wpad"
--> source_dependency = 7678 (TRANSPORT_CONNECT_JOB)
t= 2 [st= 0] HOST_RESOLVER_IMPL_JOB_STARTED
t= 2 [st= 0] +HOST_RESOLVER_IMPL_PROC_TASK [dt=2256]
t= 2 [st= 0] HOST_RESOLVER_IMPL_ATTEMPT_STARTED
--> attempt_number = 1
t= 2 [st= 0] HOST_RESOLVER_IMPL_JOB_REQUEST_ATTACH
--> priority = "IDLE"
--> source_dependency = 7678 (TRANSPORT_CONNECT_JOB)
t= 2 [st= 0] HOST_RESOLVER_IMPL_JOB_REQUEST_ATTACH
--> priority = "IDLE"
--> source_dependency = 7683 (TRANSPORT_CONNECT_JOB)
t=2258 [st=2256] HOST_RESOLVER_IMPL_ATTEMPT_FINISHED
--> attempt_number = 1
--> net_error = -105 (ERR_NAME_NOT_RESOLVED)
--> os_error = 11001
--> os_error_string = "No such host is known.\r\n"
t=2258 [st=2256] -HOST_RESOLVER_IMPL_PROC_TASK
--> net_error = -105 (ERR_NAME_NOT_RESOLVED)
--> os_error = 11001
--> os_error_string = "No such host is known.\r\n"
t=2258 [st=2256] -HOST_RESOLVER_IMPL_JOB
--> net_error = -105 (ERR_NAME_NOT_RESOLVED)
-------------------
About a month ago we started to load balance our DNS queries via NetScaler to our Active Directory DNS servers.
WPAD was on 'DNS block list' on all but 1 server (out of 4).
We've removed this record from the block list and so far no complaints... I'm waiting for 7 days before I confirm it's working.
I wasn't aware of net-export, this has helped identify a cause - thanks for that.
I'll post back this time next week to confirm it's resolved.
Thanks
,
Jul 31
Thanks for the update! I will tentatively mark this as closed. To be getting ERR_PROXY_CONNECTION_FAILED implies that the (system) proxy setting you are using specifies both auto-detect AND an explicit proxy server. Since auto-detect is best effort (except when configured as mandatory in Chrome). |
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Comment 1 by pastarmovj@chromium.org
, Jul 30