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I have my site set up to email me whenever an error happens, and recently I've been getting an occasional notification (a few per day) about a page not found error, but the weird thing is that the error is for a domain other than my own. Here's an example of the error (my domain isn't ncbels.org). Any idea what could be causing this?

I suspect my site is being used to probe/attack other domains somehow (do you agree?). I'm not sure how to track it down without more information. I searched all my site files for references to that domain, as well as any free text fields in my database, and didn't find anything. My hosting provider ran a scan on my site and said it came up clean.

Error in page https://mail.ncbels.org/owa/auth/logon.aspx?url=https://mail.ncbels.org/owa/&reason=0

Message The file '/owa/auth/logon.aspx' does not exist.

Trace CheckVirtualFileExists at offset 9984736 in file:line:column :0:0 GetVPathBuildResultInternal at offset 475 in file:line:column :0:0
GetVPathBuildResultWithNoAssert at offset 103 in file:line:column :0:0 GetVirtualPathObjectFactory at offset 165 in file:line:column :0:0
CreateInstanceFromVirtualPath at offset 43 in file:line:column :0:0 GetHandlerHelper at offset 31 in file:line:column :0:0 GetHandler at offset 37 in file:line:column :0:0
System.Web.HttpApplication.IExecutionStep.Execute at offset 346 in file:line:column :0:0 ExecuteStep at offset 155 in file:line:column :0:0

StackTrace at System.Web.UI.Util.CheckVirtualFileExists(VirtualPath virtualPath) at System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile, Boolean throwIfNotFound, Boolean ensureIsUpToDate) at System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(VirtualPath virtualPath, HttpContext context, Boolean allowCrossApp, Boolean throwIfNotFound) at System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp) at System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) at System.Web.UI.PageHandlerFactory.GetHandler(HttpContext context, String requestType, String virtualPath, String path) at System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

Query String url=https%3a%2f%2fmail.ncbels.org%2fowa%2f&reason=0

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Source System.Web

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Error Code -2147467259

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  • I'm going to guess that the system you have installed that emails you of errors is faulty. Each server that hosts websites will have a web server installed that produces results of each incoming requests in logs. If the web server is apache, then look in error_log and access_log files. Its very likely some remote user or robot is trying to access files that just simply are not supposed to exist.
    – Mike -- No longer here
    Apr 27, 2016 at 16:46
  • Yeah, I get those errors as well: sometimes a robot scans my site looking for files it hopes exist so it can exploit a vulnerability, so I get a bunch of 404's for that. However, they're always for my own domain. This one is listing a domain I don't control in the error, which is what has me concerned. It makes me think that my site is being made to make a request to a remote server.
    – Link774
    Apr 27, 2016 at 19:21

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