Looks like your client is not presenting the certificate to the stunnel server. Maybe because it does not trust the server certificate? Did you import your stunnel server cert into windows certificate store?

-----Original Message----- From: ProPharma Systems AG - Gregor Bürgisser g.buergisser@propharma.ch Sender: stunnel-users-bounces@stunnel.org Date: Thu, 28 Jun 2012 12:48:53 To: stunnel-users@stunnel.org Subject: [stunnel-users] Interoperability problems with .net client software

Hi all,

I'm using stunnel 4.53 under Linux to secure a service. There are two different clients connecting to this service: My own client, also Linux based and using libcurl and another (third party!) client being developed using Microsoft .net stuff.

Of course with my own client all works well. But we are not able to get the Microsoft client running. stunnel keeps on telling:

SSL_accept: 140890C7: error:140890C7:SSL routines:SSL3_GET_CLIENT_CERTIFICATE:peer did not return a certificate

We have tried diffierent things... I will outline them here if you think it is helpful (in short: tried using certificates generated on the Microsoft side, then tried using certificates created on the Linux side). If "verify" ist set to 0 or 1 it works (of course) but with a higher value the above message is logged.

Are there any known pitfalls, problems or whatsoever when using stunnel with a .net client? Any advice would be appreciated!

Regards, Gregor _______________________________________________ stunnel-users mailing list stunnel-users@stunnel.org http://stunnel.mirt.net/mailman/listinfo/stunnel-users