Batch uploading of files to Apache web server

I have an application written in Visual Basic .NET. Application is written for .NET Framework version 1.1. One of the threads in my application uploads local files to remote Apache 2 web server. It uses HTTP PUT method for uploading. After uploading several files the application throws an exception "The operation has timed-out.". I know that I get this exception because the number of concurrent connections to web server is limited. However, I tried several different methods of uploading but I was not able to re-use existing connections. What I expect from service provider? I expect that he/she fixes this method or to be able to provide a working workaround. I will provide source code of method that uploads these files. I can also provide access to our test web server. Please no bids above 35$.