Here’s some insight into this req-resp - on the second HTTP POST with correct 
credentials, HTTP 302 is returned and browser simply re-issues GET to the 
/login resource:

Remote Address:75.101.143.131:80
Request URL:http://mycas.commercehub.cloudbees.net/login
Request Method:POST
Status Code:302 Found

Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8,ru;q=0.6
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:137
Content-Type:application/x-www-form-urlencoded
Cookie:JSESSIONID=9E5C40753758BC75CDC6A9FE5344FD28
Host:mycas.commercehub.cloudbees.net
Origin:http://mycas.commercehub.cloudbees.net
Referer:http://mycas.commercehub.cloudbees.net/login;jsessionid=9E5C40753758BC75CDC6A9FE5344FD28
User-Agent:Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 
(KHTML, like Gecko) Chrome/35.0.1916.114 Safari/537.36

username:dummy
password:12345
lt:LT-124-z9dnswJnrDmWWEpWVDTJJsZgusHyD9-localsso.example.com
execution:e1s2
_eventId:submit
submit:SIGN IN
Response Headersview source
Cache-Control:no-cache
Cache-Control:no-store
Connection:keep-alive
Content-Length:0
Date:Fri, 27 Jun 2014 18:04:04 GMT
Expires:Thu, 01 Jan 1970 00:00:00 GMT
Location:http://mycas.commercehub.cloudbees.net/login
Pragma:no-cache
Server:nginx/1.4.2 

Browser culprit? Nginx webserver culprit? No culprit?

Cheers,
Dmitriy.

On Jun 27, 2014, at 1:22 PM, Zac Harvey <[email protected]> wrote:

> I am on CAS 4.0.0 and am experiencing what I *believe* is a bug in the login 
> webflow.  To see this yourself:
>  
> 1.  Go to http://mycas.commercehub.cloudbees.net/login (my DEV/dummy CAS 
> server).
> 2.  Enter username of “dummy”
> 3.  Enter password of “abc” and hit [ENTER] or slick the “Sign In” button
> 4.  You’ll get an error: “The username or password that you supplied is 
> incorrect.” (the password is bad)
> 5.  Re-enter the correct password: “12345”
> 6.  The login form resets!  Both username and password clear, whereas it 
> should have logged you in
> 7.  Re-enter username/password with correct values (“dummy”/”12345” without 
> the quotes of course)
> 8.  About 50% of the time it will allow you to login, and about 50% of the 
> time it will just reset the login form again.  If this happens, it will never 
> log you in; every time you login with good credentials it will just do a form 
> reset.  The only way to fix this is to hit F5 (page refresh), and you can 
> then login with success.
>  
> This happens in all browsers and does not happen unless your logins fail.  
> Anybody know why this could be happening?  Thanks in advance!
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