2003 Server Vs 2008 Server

i have vb.net webservices , console apps run fine on 2003 server receive below error when trying run on 2008 server.  proxy used both 2003 , 2008 servers same, on same network, in same data center.  has else had issue , know start looking resolution? i'm assuming there configuration change needs occur on 2008 servers i'm not sure look.  web , knowledge base have not pointed me in direction.

here error i'm receiving:

unhandled exception: system.net.webexception: remote server returned erro
r: (407) proxy authentication required. ---> system.componentmodel.win32exceptio
n: token supplied function invalid
   @ system.net.ntauthentication.getoutgoingblob(byte[] incomingblob, boolean t
hrowonerror, securitystatus& statuscode)
   @ system.net.ntauthentication.getoutgoingblob(string incomingblob)
   @ system.net.ntlmclient.doauthenticate(string challenge, webrequest webreque
st, icredentials credentials, boolean preauthenticate)
   @ system.net.ntlmclient.authenticate(string challenge, webrequest webrequest
, icredentials credentials)
   @ system.net.authenticationmanager.authenticate(string challenge, webrequest
 request, icredentials credentials)
   @ system.net.authenticationstate.attemptauthenticate(httpwebrequest httpwebr
equest, icredentials authinfo)
   @ system.net.httpwebrequest.checkresubmitforauth()
   @ system.net.httpwebrequest.checkresubmit(exception& e)
   --- end of inner exception stack trace ---
   @ system.net.httpwebrequest.getresponse()
   @ newsreleaseparse.newsreleaseparsemodule.main() in c:\documents , setting
s\rvondrak\my documents\visual studio 2008\projects\newsreleaseparse\newsrelease
parse\newsreleaseparsemodule.vb:line 19

i'd ask them here.

http://www.iis.net/

 

 

 

 

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regards, dave patrick ....
microsoft certified professional
microsoft mvp [windows]

Windows Server  >  Server Manager