KB Issue

The URL used in the URL Rewrite Rule throws a 500 error.

Issue Details

If the URL Is Not properly formatted, you may encounter a 500 error when creating the URL rewrite rule.

500 - Internal Server Error.
There is a problem with the resource you are looking for, and it cannot be displayed.

[Updated]

Dated: June 24, 2026
I wanted to display the actual error you will receive when you have a malformed Rewrite rule in your web.config file, so I edited my file to generate this error to show here.

The Full Error

HTTP Error 500.19 - Internal Server Error

The requested page cannot be accessed because the related configuration data for the page is invalid.

Detailed Error Information:

ModuleIIS Web Core
NotificationBeginRequest
HandlerNot yet determined
Error Code0x8007000d
Config ErrorConfiguration file is not well-formed XML
Config File\\?\G:\Inetpub\wwwroot\new\web.config
Requested URLhttp://localhost:80/new/Main.asp?Type=Page&ID=7283
Physical PathG:\Inetpub\wwwroot\new\Main.asp
Logon MethodNot yet determined
Logon UserNot yet determined
Request Tracing DirectoryG:\inetpub\logs\FailedReqLogFiles

Config Source:
39::<match url="Main/([ 0-9a-z-(-)-,-]+)" />
40::<action type="Rewrite" url="Main.asp?Type=Page&ID={R:1}&Page=1" />
41::</rule>

Recreate Issue

The URL is not properly formatted for the Rewrite rule.

[ASP.NET - web.config Rewrite Rule]

CFFCS | CarrzSynEdit: | ASP.NET (VB/C#)

   <rule name="MyRule" stopProcessing="true">
        <match url="MyRule/([ 0-9a-z-(-)-,-]+)/([ 0-9a-z-(-)-,-.-]+)/([ 0-9a-z-(-)-,-]+)" />
        <action type="Rewrite" url="default.asp?Type=Page&ID={R:1}&Name={R:2}&GID={R:3}" appendQueryString="true" />
    </rule>

Resolve IssueThere has to be & instead of the single & symbol.

[ASP.NET - web.config Rewrite Rule]

CFFCS | CarrzSynEdit: | ASP.NET (VB/C#)

    <rule name="MyRule" stopProcessing="true">
        <match url="MyRule/([ 0-9a-z-(-)-,-]+)/([ 0-9a-z-(-)-,-.-]+)/([ 0-9a-z-(-)-,-]+)" />
        <action type="Rewrite" url="default.asp?Type=Page&ID={R:1}&Name={R:2}&GID={R:3}" appendQueryString="true" />
    </rule>