AuthenticateRequest for robots.txt take too long.

[basit74 Profile]

I am have a very strange problem on my IIS 7.5 Server.

As soon as google Robot send a GET request for robots.txt file. ISAPI Module calls AuthenticateRequest method and then it seems that this process never end till the
complete resources i.e 4GB RAM and 100% CPU will be occupied by this process. And I have to restart the server.

PS: initially robots.txt does not exists.

[HeliconAndrew]

Hello,

Would you, pls, provide us with the rules you're using?

Regards
Andrew

[basit74 Profile]

Hi,

Here are the rules what I am using

RewriteMap map txt:map.txt

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{QUERY_STRING} (?!admin)
RewriteCond ${map :${lower:$1}|NOT_FOUND} !NOT_FOUND
RewriteRule ^(.*?\.(?:html|gif|jpg|png)) ${map :${lower:$1}} [NC,L,NS,QSA]

[HeliconAndrew]

This could be not the authentication issue, but permissions issue.
For example ISAPI_Rewrite doesn't have sufficient permissions to read mapfile.
Please, follow this article to resolve it - http://www.helicontech.com/isapi_rewrite/doc/security.htm

Regards
Andrew

[basit74 Profile]

Hi,

Thank a lot for the prompt response. I don't think that it is a permissions issue. As in general the mapping works.
With the passage of time it consumes more RAM and CPU resources.

But what some how strange is that the some of the following GET requests never come to an end.

Code: Select all

/
/robots.txt


[HeliconAndrew]

What build are you using?
What IIS version is this?

Would you, please, provide error.log and rewrite.log for a testing request?
Logging issues are described in FAQ - http://www.helicontech.com/forum/10648-FAQ.html

Regards
Andrew

[basit74 Profile]

We have

Helicon ISAPI Rewrite b Build (3.1.0.78)
IIS 7.5

on Windows Server 2008 R2 Standard Service Pack 1

A screensort is attatched, which shows /robots.txt request is hanged on

[HeliconAndrew]

Hello,

try to uninstall ISAPI_Rewrite and install the latest build. This should fix the problem.
If it doesn't fix the problem, try to completely remove the ISAPI_Rewrite and see GET request are still causing issues. This may not be ISAPI_Rewrite's fault at all.

Regards
Andrew