title: What is /citrix/xenapp/auth/login.aspx
body: <p>I have an ASP.Net webform website that uses SQL Membership for authentication and login. The user's password are encrypted.</p>
  
  <p>In my project I save all exceptions when they happened in a database. 
  Yesterday I have got this exception which is very wired and I do know about it.
  I am assuming that somebody was trying to hack the website. </p>
  
  <p><strong>Error:</strong> Global.asax: www.Example.com/<strong>citrix/xenapp/auth</strong>/login.aspx?<strong>CTX_MessageType=WARNING&amp;CTX_MessageKey=NoUsableClientDetected</strong></p>
  
  <p>I have this URL: www.Example.com/login.aspx but why somebody did this citrix/xenapp/auth/login.aspx  with some Querystrings.</p>
  
  <p>If it was an attack the SQL Membership is secure enough?
  If you have any idea please let me know before something happened.</p>
  
  <p>Thanks</p>