please explain HTTP_RVP / continual http 501 errors

Could somebody shed some light onto what HTTP_RVP is? On our IIS
webserver we have continual 501 errors appearing. All of these
contain HTTP headers with things like HTTP_RVP_NOTIFICATIONS_VERSION
and HTTP_RVP_FROM_PRINCIPAL. I have found this explanation of 501
errors (http://www.checkupdown.com/status/E501.html), but it doesn't
help with explaining why we are getting them.

My questions:

What is RVP?
Is our webserver misconfigured and should be returning something to
these requests?
How do I make this stop?

Thanks,
Jeff

Re: please explain HTTP_RVP / continual http 501 errors

On Oct 30, 10:18 am, jqheller wrote:
> Could somebody shed some light onto what HTTP_RVP is? On our IIS
> webserver we have continual 501 errors appearing. All of these
> contain HTTP headers with things like HTTP_RVP_NOTIFICATIONS_VERSION
> and HTTP_RVP_FROM_PRINCIPAL. I have found this explanation of 501
> errors (http://www.checkupdown.com/status/E501.html), but it doesn't
> help with explaining why we are getting them.
>
> My questions:
>
> What is RVP?
> Is our webserver misconfigured and should be returning something to
> these requests?
> How do I make this stop?
>
> Thanks,
> Jeff



501 means that the HTTP client used a verb which the HTTP server did
not implement (and thus does not support processing).

Since you cannot control what clients send to your web server, there
is no way you can make them stop. A log file is supposed to record
what happened, not what you expect, so it is perfectly fine for it to
have 501s. It is supposed to draw your attention to do something about
it, if you want.

Your server is not misconfigured, unless you are running custom
software that uses those verbs.

Since you say you don't expect them, you can configure your router to
drop those requests. And you can look through the client-ip and see if
you can figure out who is sending the requests.


//David
http://w3-4u.blogspot.com
http://blogs.msdn.com/David.Wang
//