I'm tying to invoke a external url from my zimlet via ProxyServlet, but show me CircularRedirectException (in log file) . Any idea to solve this error?

I added the domain with zmprov command
zmprov mc default +zimbraProxyAllowedDomains *.e-planning.net

I can request others urls without problems
Reproduced the same error when invoke the url

http://10.53.0.25/service/proxy?targ...%26n%3D492x212


Error in Log file:

2010-05-05 08:14:10,633 INFO [btpool0-28://10.53.0.25/service/proxy?target=http%3A%2F%2Fads.e-planning.net%2Feb%2F3%2F42ac%2Fwebmail%2FSkyx120x6 00%3Fo%3Dj%26n%3D492x212] [] zimlet - exception while proxying http://ads.e-planning.net/eb/3/42ac/...?o=j&n=492x212
org.apache.commons.httpclient.CircularRedirectExce ption: Circular redirect to 'http://ads.e-planning.net:80/eb/3/42ac/webmail/Skyx120x600'
at org.apache.commons.httpclient.HttpMethodDirector.p rocessRedirectResponse(HttpMethodDirector.java:630 )
at org.apache.commons.httpclient.HttpMethodDirector.e xecuteMethod(HttpMethodDirector.java:178)
at org.apache.commons.httpclient.HttpClient.executeMe thod(HttpClient.java:396)
at org.apache.commons.httpclient.HttpClient.executeMe thod(HttpClient.java:324)
at com.zimbra.cs.zimlet.ProxyServlet.doProxy(ProxySer vlet.java:227)
at com.zimbra.cs.zimlet.ProxyServlet.doGet(ProxyServl et.java:141)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:707)
at com.zimbra.cs.servlet.ZimbraServlet.service(Zimbra Servlet.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet .java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(Ser vletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1166)
at com.zimbra.cs.servlet.SetHeaderFilter.doFilter(Set HeaderFilter.java:79)
at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1157)
at org.mortbay.servlet.UserAgentFilter.doFilter(UserA gentFilter.java:81)
at org.mortbay.servlet.GzipFilter.doFilter(GzipFilter .java:132)
at org.mortbay.jetty.servlet.ServletHandler$CachedCha in.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(Se rvletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle( SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(Se ssionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(Co ntextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebA ppContext.java:418)
at org.mortbay.jetty.handler.ContextHandlerCollection .handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle (HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.handler.rewrite.RewriteHandler.h andle(RewriteHandler.java:230)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.handler.DebugHandler.handle(Debu gHandler.java:77)
at org.mortbay.jetty.handler.HandlerWrapper.handle(Ha ndlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(Htt pConnection.java:543)
at org.mortbay.jetty.HttpConnection$RequestHandler.he aderComplete(HttpConnection.java:924)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser. java:547)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpPa rser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnec tion.java:405)
at org.mortbay.io.nio.SelectChannelEndPoint.run(Selec tChannelEndPoint.java:409)
at org.mortbay.thread.BoundedThreadPool$PoolThread.ru n(BoundedThreadPool.java:451)