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Forms Authentication - Bad Redirect on POST

I'm having a problem with .NET Forms Authentication in a particular
application. It's not redirecting properly when my session is timed
out, seemingly only when I POST the page (i.e. click a form submit
button). If I try to GET a page after timeout (i.e. just picking a page
to visit from a menu), I am redirected to the login screen properly.

The browser error I'm getting in the POST example is "403.1 Execute
Access Forbidden". I looked into the IIS logs to compare these two
situations and found this...

Web logs during a GET after timeout:
2004-01-02 23:11:38 GET /app/bondsearch.aspx - 302
2004-01-02 23:11:38 GET /LoginPage.aspx
ReturnUrl=%2fapp%2fbondsearch.aspx 200

which looks fine, I'm getting a 302 (temp redirect) on the attempted
GET, followed by a GET redirected to the login form. However...

Web logs during a POST after timeout:
2004-01-02 22:40:36 POST /app/bondsearch.aspx - 302
2004-01-02 22:40:36
UwMC4wMDs%2BPjs%2BOzs%2BO3Q8cDxwPGw8Q3NzQ2xhc3M7Xy FTQjs%2BO2w8c21hbGxsYW
JlbDtpPDI%2BOz4%2BOz47Oz47dD /LoginPage.aspx
ReturnUrl=%2fapp%2fbondsearch.aspx 403

which is very confusing... it looks like I got a string of nonsense in
place of a normal http verb, but the rest of the line is fine, it
contains the requested resource and proper query string for return url.

Any suggestions? I can't seem to find reference to this issue in the
newsgroups. Thanks in advance for your help!

I'm using .NET framework 1.1. Here's the pertinent snippet of

<authentication mode="Forms">
<forms loginUrl="LoginPage.aspx" name=".ASPXFORMSAUTH" path="/"
protection="All" timeout="1">
<credentials passwordFormat="Clear">

<deny users="?" />
<allow users="*" />
Ed Henn
Sacramento Superior Court MIS
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Nov 18 '05 #1
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