Access Denied to Root of Web Application

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Hi,

I have a website running on my local IIS 7.5 server. The site has two class libraries, call them LibA and LibB. Both are copied to the same sub-folder on build. LibA writes to a text file in the root directory of the website. This works fine. However, when LibB raises an event, which triggers a call to the same function in LibA to write to the same text file, it fails with an exception which says access to the file is denied.

As far as I understand it, both these libraries should be loaded into the same AppDomain, so I don't understand why one library has permissions that the other doesn't. And, given the fact that the actual file writing is always done by LibA, I don't understand why different permissions are required at all.

I have no idea what is going on here. Any help would be gratefully received.

Kind wishes, Patrick

Posted 21-Mar-13 10:32am

Patrick Skelton

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Dave Kreskowiak · Answer 1 · 2013-03-21T10:58:00

Solution 1

This may sound like a stupid question, but did your code Close the file before it tried to open it again??

Sometimes "Access Denied" has nothing to do with security at all. The file can be locked by a process, be it your own or a different one, and you'll get this message.

Posted 21-Mar-13 10:58am

Dave Kreskowiak

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Maciej Los 21-Mar-13 17:12pm

There are no stupid questions, there are stupid answers, but your answer is perfect!
+5!

Patrick Skelton 22-Mar-13 13:02pm

Thank you for the reply.

The access is wrapped in a lock() {} statement and the file handle is acquired in a using() {} statement, so - in theory - neither of your suggestions should be the problem.

Really stuck with this one. :-(

Dave Kreskowiak 22-Mar-13 13:51pm

In that case, does the account that ASP.NET is using have write permissions to the folder where the file is going? That's about all I've got.

Patrick Skelton 22-Mar-13 14:06pm

Mmm ... it seems you are right. It was nothing to do with one library being able to write and the other not. I definitely recall giving IIS_IUSRS adequate permission for this folder, but it seems to have disappeared. It works now.

Oddly though, calls to write to this folder/file were succeeding from Global.asax, even without the permissions in place. Does the Global.asax code run under a different user to the actual pages of the website?

Dave Kreskowiak 22-Mar-13 14:10pm

It shouldn't be. It's still part of the same code the rest of the site is running.

Patrick Skelton 22-Mar-13 14:13pm

I've double-checked. I wouldn't believe it if I weren't seeing it with my own eyes. Very odd indeed.

Thank you for the help.

Dave Kreskowiak 22-Mar-13 14:35pm

Glad you got it fixed!

Sivakrishna Donepudi · Answer 2 · 2013-03-21T12:31:00

Solution 2

Try , setting Domain Account as ApplicationPoolIdentity.

Posted 21-Mar-13 12:31pm

Sivakrishna Donepudi

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Patrick Skelton 22-Mar-13 12:49pm

Thank you for the reply, but it is already set to this.

- Patrick