Hello, I did not check the previous posts. I apologize. The Proxy Server in our organization allows access to Internet. I am using Oracle WebLogic Server. During the startup of WLS, I defined -Dhttp.proxyHost=... -Dhttp.proxyUser=... -Dhttp.proxyPassword=.... I wrote a very simple Servlet that access an external site. I am getting the following exception [Thu Mar 10 06:35:44 EST 2011] [[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'] response - weblogic.net.http.MessageHeader@28e00c6{null: HTTP/1.0 407 Proxy Authentication Required}{Server: squid/2.6.STABLE21}{Date: Thu, 10 Mar 2011 11:35:39 GMT}{Content-Type: text/html}{Content-Length: 1394}{Expires: Thu, 10 Mar 2011 11:35:39 GMT}{X-Squid-Error: ERR_CACHE_ACCESS_DENIED 0}{Proxy-Authenticate: Basic realm="Squid proxy-caching web server"}{X-Cache : MISS from ???????}{X-Cache-Lookup: NONE from ??????:80}{Via: 1.0 ???????:80 (squid/2.6.STABLE21)}{Proxy-Connection: close} [Thu Mar 10 06:35:44 EST 2011] [[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default(self-tuning)'] Proxy Authentication required ... weblogic.net.http.HttpUnauthorizedException: Proxy or Server Authentication Required at weblogic.net.http.HttpURLConnection.getAuthInfo(HttpURLConnection.java:297) at weblogic.net.http.HttpURLConnection.getInputStream(HttpURLConnection.java:468) at weblogic.net.http.SOAPHttpURLConnection.getInputStream(SOAPHttpURLConnection.java:37) I am posting this question here is because I am seeing "squid" in the trace. I hope I provided all the information needed to sort out this issue. Has anyone run into this issue before? Any help is much appreciated. Mustafa