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.NET Forum / ASP.NET / General / March 2008Prompt for username/password opening PDF
We have an application that displays the content of a file based on the file name suffix, e.g. if "pdf" it uses Response.ContentType = "application/pdf" and then to display it it uses Response.WriteFile(FilePath) and it works fine for all but very large files. For very large files (e.g. a 5MB file) it pops up a prompt for username and password for the domain and I can't figure out why. Does any one know how I can solve this or where to look? The application is NT Authority only intranet site. Smaller files are not a problem. Thanks. David My guess would be the IIS accounts do not have permission to the file... what I say here is just a guess and not confirmed or read anywhere... *************** For small files .NET handles Response.WriteFile itself.... reads file and sends it over to browser so only ASP.NET account needs to have read permissions... For big files .NET asks IIS do it (there is an API in ISAPI to do so)... hence IIS_USRXXXX account needs to be able to read that file... ************************ George. > We have an application that displays the content of a file based on the > file name suffix, e.g. if "pdf" it uses [quoted text clipped - 12 lines] > Thanks. > David When you say IIS_USRXXXX are you meaning the IUSR_COMPUTERNAME account? Not sure if this helps, but users can open the file just fine from Windows Explorer. David > My guess would be the IIS accounts do not have permission to the file... > [quoted text clipped - 27 lines] >> Thanks. >> David Yes, you right... It must be IUSR_COMUTERNAME and IWAM_COMPUTERNAME. Does not matter that user can open from Windows Explorer. Those 2 accounts IIS is running under (by default)... When it can not open files then it sends back prompt for username/password trying to authenticate user and access files under his account. George. > When you say IIS_USRXXXX are you meaning the IUSR_COMPUTERNAME account? > [quoted text clipped - 33 lines] >>> Thanks. >>> David I checked my setup here and I do not have any permissions set for either of those accounts but I can open files fine. However, at our customer site they have the problem with large files. These files are opened from a virtual directory that is part of the web site. Would that be where the permissions are needed and not in the actual file system itself? Thanks. David > Yes, you right... It must be IUSR_COMUTERNAME and IWAM_COMPUTERNAME. > [quoted text clipped - 42 lines] >>>> Thanks. >>>> David You might be quietly authenticated using NT Authentication.. hence IIS is running under your network account and can access files... Your customer though can not be quietly authenticated since most likely they do not sit on your network and not part of the domain... Hence the prompt. You can test it by unchecking "NT Authentication" in IIS Managmen console and leaving only "Anonymous" and see if you start getting the prompt... George. >I checked my setup here and I do not have any permissions set for either of >those accounts but I can open files fine. However, at our customer site [quoted text clipped - 50 lines] >>>>> Thanks. >>>>> David I'm sorry, I forgot to tell you that the customer is on their own servers/domain and they are getting the prompt for their domain, not ours. Sorry if I wasn't clear. We developed the site for them and they are getting the prompt at their site but we do not get prompted at our site. The web is "NT Authentication" only so we cannot (and do not want to) check the anonymous user as we read their login name from the network. If I add anonymous then I cannot read their login name. David > You might be quietly authenticated using NT Authentication.. hence IIS is > running under your network account and can access files... [quoted text clipped - 62 lines] >>>>>> Thanks. >>>>>> David
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