Hello,

I have a windows machine running as a stunnel client that establishes a session but then, when launching an SSH session to my loopback crashes. Putty reports that the "Server unexpectedly closed the network connection." Here are the logs:

2016.08.30 16:06:08 LOG5[main]: Reading configuration from file stunnel.conf

2016.08.30 16:06:08 LOG5[main]: UTF-8 byte order mark detected

2016.08.30 16:06:08 LOG5[main]: FIPS mode disabled

2016.08.30 16:06:08 LOG4[main]: Service [squid] needs authentication to prevent MITM attacks

2016.08.30 16:06:08 LOG5[main]: Configuration successful

2016.08.30 16:06:17 LOG5[2]: Service [squid] accepted connection from 127.0.0.1:55791

2016.08.30 16:06:17 LOG5[2]: s_connect: connected 10.5.8.74:8888

2016.08.30 16:06:17 LOG5[2]: Service [squid] connected remote server from 10.5.8.69:55792

2016.08.30 16:06:17 LOG5[2]: Connection closed: 28 byte(s) sent to SSL, 0 byte(s) sent to socket

Here is the server-side stunnel.conf:

sslVersion = all

options = NO_SSLv2

client = no

cert = /etc/stunnel/server.pem

pid = /var/run/stunnel.pid

output = /var/log/stunnel

[squid]

accept = 8888

connect = 127.0.0.1:3128

cert = /etc/stunnel/stunnel.pem

[openvpn]

client = no

accept = 993

connect = 34567

Here is the client side (Windows 7):

cert = stunnel.pem

client = yes

[squid]

accept = 127.0.0.1:8080

connect = 10.5.8.74:8443

I seem to be negotiating all of the appropriate keys, openvpn and squid3 are verified running, and have iptables configured, so I am not sure what I am missing. Can anyone assist?

Thanks in advance!

Mike