I have solved my problem. The problem in my case was a server one. I use a non-blocking socket for the server to receive information from the clients, so the server performs a select with a timeout of 1 second to read information. It turns out that when they are network issues, 1 second is not enough and the select times out with a 0 return value, so the server was assuming that the client is gone and closes the connection....
Now, when the select times out I check the errno and if it is EAGAIN, I try select again... This solved the problem and all clients now are handled correctly... What confused me is the man select documentation which states that select sets errno only if the return value is -1... it seems that even if it returns 0 errno might be set... I have seen this problem on Linux and Hp platforms... Thanks On Wed, Jan 7, 2009 at 1:44 PM, Andrey Koltsov <kolt...@cyberplat.com>wrote: > I have the same problem with my client Openssl application. The server side > is MS IIS. And all other parties use Microsoft based clients and have no > such problems. > It seems that a client side is a source of trouble not a server side. > > Suggestions from anyone are welcome. > > > Hi, >> >> I have an SSL server handling many clients successfully using >> openssl-0.9.8e. From time to time however, there are some clients that >> fail >> to connect to it. Debugging shows that the problem happens when the client >> attempts the first SSL_read, which unexpectedly returns 0. >> >> Checking then for the SSL error shows that it has the value >> SSL_ERROR_ZERO_RETURN. According to the SSL documentation this should >> happen >> only if the SSL connection has been closed. I do know that my server is >> not >> closing it since it is handling many other clients correctly, I also know >> that for the clients facing this problem, the handshake phase is done >> correctly.... it is only when the first SSL_read happens that somehow the >> connection is dropped.... I have no idea why if anyone can help me. >> >> Thanks >> >> > > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-users@openssl.org > Automated List Manager majord...@openssl.org >
