WinHttp Configuration for Windows Vista
In my previous posts, I described the new WinHttp proxy, tracing and client certificate configuration story for Windows Vista Beta2. The syntax of the netsh commands used to configure WinHttp proxy and tracing settings have changed for Vista RTM and this post describes the changes in command syntax since the beta.
WinHttp Netsh Context
From the previous posts you might be aware that in Windows Vista, the WinHttp proxy and tracing configuration tools, proxycfg.exe and winhttptracecfg.exe respectively, have been replaced with netsh commands. All the WinHttp related netsh commands live under the “winhttp” netsh context. To navigate to it, open an administrator command prompt and type “netsh” then “winhttp”:
You can type “?” in this context and display the list of available commands there. You can also type “?” at the end of any command to get a detailed description of the command syntax.
Displaying current settings and restoring the defaults
You can use the “show” netsh commands to display the current settings. “show proxy” will display the current proxy settings, while “show tracing” will display the current tracing settings. You can also use the “reset” netsh command to restore the default settings. “reset proxy” will set the WinHttp proxy settings to DIRECT, while “reset tracing” will disable the tracing.
Setting WinHttp proxy settings
Use the “set proxy” command to configure the proxy settings. You can type the command followed by a question mark to see the syntax:
netsh winhttp>set proxy /?
Usage: set proxy [proxy-server=]<server name> [bypass-list=]<hosts list>
proxy-server - proxy server for use for http and/or
bypass-list - a list of sites that should be visited
bypassing the proxy (use "<local>" to
bypass all short name hosts)
set proxy myproxy
set proxy myproxy:80 "<local>bar"
set proxy proxy-server="http=myproxy;https=sproxy:88" bypass-list="*.foo.com"
Just follow the examples listed in the samples above to set your proxy settings.
Note that importing proxy settings from IE is now accomplished by the “import” command (importing from IE is the only available option there):
netsh winhttp>import proxy /?
Usage: import proxy [source=]ie
source - from where the setting is imported
import proxy source=ie
Setting WinHttp tracing settings
To set the WinHttp tracing settings, use the “set tracing” command from the netsh winhttp context:
netsh winhttp>set tracing /?
Usage: set tracing
trace-file-prefix - Prefix for the log file (can
include a path) specify "*" to
delete an existing prefix
output - Where the trace entries are
level - How much information to log
format - Display format of network traffic
(hex or ansi)
max-trace-file-size - Maximum size of the trace file (in
state - Enables or disables winhttp tracing
set tracing trace-file-prefix="C:\Temp\Test3" level=verbose format=hex
set tracing output=debugger max-trace-file-size=512000 state=enabled
Please note that you can use the “state” parameter to disable / enable the tracing. For example, “set tracing state=disabled” will disable the tracing.
Also, your process needs to have enough permissions to create the trace file, so it is recommended to specify a folder via the “trace-file-prefix” parameter that you know your process has write access to.