C# / VB.NET - [vb.net] errore upload file con xp

Essentially requests are made by opening a connection, making a number of them then closing it. In this occurance, the connection times out but is not recognized as closed and thus a new connection is not established for the next request and an error is returned.

Setting the keepalive to false sets it to close and reopen connections for each request. This taxes the server quite a bit more (some 7 connections for each new request). I would welcome any solutions to this error that don't involve this much traffic but I have yet to find any and am reluctant to write around it.

The suggestions I found indicated that setting the keepalive should solve it, yet some suggested setting the http version to 1.0.

There are variations in how the 1.0 and 1.1 versions of how the protocol work. Officially, the version 1.0 doesn't support keep-alives, however some implementations do support it.

.Net is designed to use http 1.1 to make requests which encourages persistant connections. It is more likely you'll avoid the error by forcing the use of the 1.0 protocol as it didn't take advantage of persistant connections (multiple requests per connection), however I cannot say either way as to whether the error won't still occur with the version set as 1.1

For example, leaving it set to use the 1.1 protocol will likely not try to keep the connection alive, but may still try to send more requests per connection which may cause the error to happen, just less frequently.

Unfortunately I cannot track down the original microsoft documentation on this issue as it seems to have disappeared, so outside of studying the documented http 1.0 and 1.1 versions of the protocol, comparing them and studying the .net implementation, there isn't much you can do aside from setting both to avoid the error.

The suggestions I found indicated that setting the keepalive should solve it, yet some suggested setting the http version to 1.0.