c# - no http-connection possible after occurrence of server error 503 -

i build windows-mobile 6.5 application (based on cf 2.0) , have problem special test case of 1 method. hope can give me advice or has helpful idea reason behaviour is...

the method called continuous every 30 seconds inside thread, looks files transferred via http request web server (jboss) , brings them on way. server url under control.

everything works fine ... until stop web server , force 503 server error. far good. after restarting web server, expect, next call of transfer method end in success - not. every further try ends in timeout exception , have restart application make work again.

so question is: problem, when want connect uri after earlier try has failed error 503? seems, there cached, hell should be?

many every hint have.

juergen

public static boolean httpuploadfile2(string url, string file)     {         httpwebrequest requesttoserver = null;         webresponse    response        = null;         try         {             logger.writetologfilecom(string.format("uploading {0} {1}", file, url));             requesttoserver = (httpwebrequest)webrequest.create(url);             requesttoserver. timeout = 40000;             string boundarystring = "----sslblabla";             requesttoserver.allowwritestreambuffering = false;             requesttoserver.method = "post";             requesttoserver.contenttype = "multipart/form-data;              boundary=" + boundarystring;             requesttoserver.keepalive = false;             asciiencoding ascii = new asciiencoding();             string boundarystringline = "\r\n--" + boundarystring + "\r\n";             byte[] boundarystringlinebytes = ascii.getbytes(boundarystringline);             string lastboundarystringline = "\r\n--" + boundarystring + "--\r\n";             byte[] lastboundarystringlinebytes =  ascii.getbytes(lastboundarystringline);             // byte array of myfiledescription content disposition             string myfiledescriptioncontentdisposition = string.format(                 "content-disposition: form-data; name=\"{0}\"\r\n\r\n{1}",                 "myfiledescription",                 "a sample file description");             byte[] myfiledescriptioncontentdispositionbytes                 = ascii.getbytes(myfiledescriptioncontentdisposition);             string fileurl = file;             // byte array of string part of myfile content             // disposition             string myfilecontentdisposition = string.format(                 "content-disposition: form-data;name=\"{0}\"; "                  + "filename=\"{1}\"\r\ncontent-type: {2}\r\n\r\n",                 "myfile", path.getfilename(fileurl), path.getextension(fileurl));             byte[] myfilecontentdispositionbytes =                 ascii.getbytes(myfilecontentdisposition);             fileinfo fileinfo = new fileinfo(fileurl);             // calculate total size of http request             long totalrequestbodysize = boundarystringlinebytes.length * 2                 + lastboundarystringlinebytes.length                 + myfiledescriptioncontentdispositionbytes.length                 + myfilecontentdispositionbytes.length                 + fileinfo.length;             // , indicate value http request content length             requesttoserver.contentlength = totalrequestbodysize;             // write http request body directly server                             using (stream s = requesttoserver.getrequeststream())             {                  //timeout occured when calling getrequeststream                   // send file description content disposition on server                 s.write(boundarystringlinebytes, 0, boundarystringlinebytes.length);                 s.write(myfiledescriptioncontentdispositionbytes, 0,                     myfiledescriptioncontentdispositionbytes.length);                 // send file content disposition on server                 s.write(boundarystringlinebytes, 0, boundarystringlinebytes.length);                 s.write(myfilecontentdispositionbytes, 0,                     myfilecontentdispositionbytes.length);                 // send file binaries on server, in 1024 bytes chunk                 filestream filestream = new filestream(fileurl, filemode.open,                     fileaccess.read);                 byte[] buffer = new byte[1024];                 int bytesread = 0;                 logger.writetologfilecom("writing data...");                 while ((bytesread = filestream.read(buffer, 0, buffer.length)) != 0)                 {                     s.write(buffer, 0, bytesread);                 } // end while                                     filestream.close();                 logger.writetologfilecom("... finished, file closed");                 // send last part of http request body                 s.write(lastboundarystringlinebytes, 0, lastboundarystringlinebytes.length);                 logger.writetologfilecom("... finished, file closed");             } // end using                      // grab response server. webexception thrown             // when http ok status not returned             logger.writetologfilecom("lese response");             response = requesttoserver.getresponse();             streamreader responsereader = new streamreader(response.getresponsestream());             string replyfromserver = responsereader.readtoend();             response.close();                             if (regex.split(regex.split(replyfromserver, "content\\:response\"\\>")[1], "\\</span\\>")[0].equals("ok"))             {                                     return true;             }             else             {                                   return false;             }         }         catch (exception ex)         {             logger.writetologfilecom("fehler im html sender");             logger.writetologfilecom(ex.message);             logger.writetologfilecom(ex.stacktrace);         }                 {             try             {                 if (response != null)                 {                                             response.close();                 }             }             catch (exception ex) { }         }         return false;      } 

i solved problem.

i added additional try / catch block inside clause call getresponse in every situation.

        {         try { response = requesttoserver.getresponse(); }        catch (exception ex) { }       [...]