We recently move our synchronization from our staging environment, which seemed to be working fine to our production and now frequently I get this error when I try to call the SF API.  An existing connection was forcibly closed by the remote host. This happens on regular basis. The server has framework 1.1 and 2 running. There can be concurrent calls to different salesforce.com organizations. I have pasted the stack trace of the error I get.  Has anyone faced the same issue?

An unexpected error occurred on a receive. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
   at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   --- End of inner exception stack trace ---
   at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.FixedSizeReader.ReadPacket(Byte[] buffer, Int32 offset, Int32 count)
   at System.Net.Security._SslStream.StartFrameHeader(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
   at System.Net.Security._SslStream.StartReading(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
   at System.Net.Security._SslStream.ProcessRead(Byte[] buffer, Int32 offset, Int32 count, AsyncProtocolRequest asyncRequest)
   at System.Net.TlsStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.PooledStream.Read(Byte[] buffer, Int32 offset, Int32 size)
   at System.Net.Connection.SyncRead(HttpWebRequest request, Boolean userRetrievedStream, Boolean probeRead)
   --- End of inner exception stack trace ---
   at System.Web.Services.Protocols.WebClientProtocol.GetWebResponse(WebRequest request)
   at System.Web.Services.Protocols.HttpWebClientProtocol.GetWebResponse(WebRequest request)
   at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
   at GotMarketing.Campaigner2F.SFConnector.sforce.SforceService.describeSObject(String sObjectType) in C:\PROJECTS\GOT2005\CRM\Code\CRM\GotMarketing.Campaigner2F.SFConnector\Web References\sforce\Reference.cs:line 269
   at GotMarketing.Campaigner2F.SFConnector.SalesForceConnector.DescribeObject(String tableName) in C:\PROJECTS\GOT2005\CRM\Code\CRM\GotMarketing.Campaigner2F.SFConnector\SFCommon.cs:line 125