Solution:
The remote end had connections limited to 1, and it wasn't me. They changed it to >1 and now it works fine.
On Friday 25 May 2007, F.M. Taylor formed electrons in this pattern:
I should add a little design information. Multiple machines send standard syslog udp/514 to this server, which accepts it via syslog-ng, and then forwards it to stunnel localhost:5140/tcp, which is supposed to connect to "THE" syslog server on 5140/tcp.
On Friday 25 May 2007, F.M. Taylor formed electrons in this pattern:
Greetings all. Seemed simple enough, but I can seem to get it to work. I have obviously missed something simple. Here is the info you will need (and probably some you won't). I have tried every combination of options I can think of, and I have searched the archives and the web. It looks like it is almost working, but the server I am trying to connect to never sees the data (however "they" have it working on "their" systems, so it must be me). "They" say it connects, talks a little, no real data xfer, closes, then more data (followed by the obligatory TCP_RSTs for dead connects).
[insert begging]
[root@bofh stunnel-4.20]# stunnel /etc/stunnel/stunnel.conf 2007.05.25 10:43:00 LOG7[20728:182894198944]: Snagged 64 random bytes from /root/.rnd 2007.05.25 10:43:00 LOG7[20728:182894198944]: Wrote 1024 new random bytes to /root/.rnd 2007.05.25 10:43:00 LOG7[20728:182894198944]: RAND_status claims sufficient entropy for the PRNG 2007.05.25 10:43:00 LOG7[20728:182894198944]: PRNG seeded successfully 2007.05.25 10:43:00 LOG7[20728:182894198944]: Configuration SSL options: 0x00000FFF 2007.05.25 10:43:00 LOG7[20728:182894198944]: SSL options set: 0x00000FFF 2007.05.25 10:43:00 LOG7[20728:182894198944]: SSL context initialized for service 5140 [root@bofh stunnel-4.20]# tail -f /var/log/stunnel4/stunnel.log 2007.05.25 10:43:00 LOG5[20728:182894198944]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv4 Auth:LIBWRAP 2007.05.25 10:43:00 LOG6[20728:182894198944]: file ulimit = 1024 (can be changed with 'ulimit -n') 2007.05.25 10:43:00 LOG6[20728:182894198944]: poll() used - no FD_SETSIZE limit for file descriptors 2007.05.25 10:43:00 LOG5[20728:182894198944]: 500 clients allowed 2007.05.25 10:43:00 LOG7[20728:182894198944]: FD 4 in non-blocking mode 2007.05.25 10:43:00 LOG7[20728:182894198944]: FD 5 in non-blocking mode 2007.05.25 10:43:00 LOG7[20728:182894198944]: FD 6 in non-blocking mode 2007.05.25 10:43:00 LOG7[20728:182894198944]: SO_REUSEADDR option set on accept socket 2007.05.25 10:43:00 LOG7[20728:182894198944]: 5140 bound to 127.0.0.1:5140 2007.05.25 10:43:00 LOG7[20729:182894198944]: Created pid file /var/run/stunnel4/stunnel.pid 2007.05.25 10:43:29 LOG7[20729:182894198944]: 5140 accepted FD=7 from 127.0.0.1:64820 2007.05.25 10:43:29 LOG7[20729:1073809760]: 5140 started 2007.05.25 10:43:29 LOG7[20729:1073809760]: FD 7 in non-blocking mode 2007.05.25 10:43:29 LOG7[20729:1073809760]: TCP_NODELAY option set on local socket 2007.05.25 10:43:29 LOG7[20729:1073809760]: FD 8 in non-blocking mode 2007.05.25 10:43:29 LOG7[20729:1073809760]: FD 9 in non-blocking mode 2007.05.25 10:43:29 LOG7[20729:1073809760]: Connection from 127.0.0.1:64820 permitted by libwrap 2007.05.25 10:43:29 LOG7[20729:182894198944]: Cleaning up the signal pipe 2007.05.25 10:43:29 LOG5[20729:1073809760]: 5140 accepted connection from 127.0.0.1:64820 2007.05.25 10:43:29 LOG6[20729:182894198944]: Child process 20748 finished with code 0 2007.05.25 10:43:29 LOG7[20729:1073809760]: FD 8 in non-blocking mode 2007.05.25 10:43:29 LOG7[20729:1073809760]: 5140 connecting xxx.xxx.xxx.xxx:5140 2007.05.25 10:43:29 LOG7[20729:1073809760]: connect_wait: waiting 10 seconds 2007.05.25 10:43:29 LOG7[20729:1073809760]: connect_wait: connected 2007.05.25 10:43:29 LOG5[20729:1073809760]: 5140 connected remote server from 192.168.2.23:64821 2007.05.25 10:43:29 LOG7[20729:1073809760]: Remote FD=8 initialized 2007.05.25 10:43:29 LOG7[20729:1073809760]: TCP_NODELAY option set on remote socket 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): before/connect initialization 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 write client hello A 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 read server hello A 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 read server certificate A 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 read server done A 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 write client key exchange A 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 write change cipher spec A 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 write finished A 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 flush data 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL state (connect): SSLv3 read finished A 2007.05.25 10:43:29 LOG7[20729:1073809760]: 1 items in the session cache 2007.05.25 10:43:29 LOG7[20729:1073809760]: 1 client connects (SSL_connect()) 2007.05.25 10:43:29 LOG7[20729:1073809760]: 1 client connects that finished 2007.05.25 10:43:29 LOG7[20729:1073809760]: 0 client renegotiations requested 2007.05.25 10:43:29 LOG7[20729:1073809760]: 0 server connects (SSL_accept()) 2007.05.25 10:43:29 LOG7[20729:1073809760]: 0 server connects that finished 2007.05.25 10:43:29 LOG7[20729:1073809760]: 0 server renegotiations requested 2007.05.25 10:43:29 LOG7[20729:1073809760]: 0 session cache hits 2007.05.25 10:43:29 LOG7[20729:1073809760]: 0 session cache misses 2007.05.25 10:43:29 LOG7[20729:1073809760]: 0 session cache timeouts 2007.05.25 10:43:29 LOG6[20729:1073809760]: SSL connected: new session negotiated 2007.05.25 10:43:29 LOG6[20729:1073809760]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL alert (read): warning: close notify 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL closed on SSL_read 2007.05.25 10:43:29 LOG7[20729:1073809760]: Socket write shutdown 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL write shutdown 2007.05.25 10:43:29 LOG7[20729:1073809760]: SSL alert (write): warning: close notify 2007.05.25 10:43:29 LOG6[20729:1073809760]: SSL_shutdown successfully sent close_notify 2007.05.25 10:43:29 LOG5[20729:1073809760]: Connection closed: 303 bytes sent to SSL, 0 bytes sent to socket 2007.05.25 10:43:29 LOG7[20729:1073809760]: 5140 finished (0 left)
/etc/stunnel/stunnel.conf
setuid = stunnel4 setgid = stunnel4 pid = /var/run/stunnel4/stunnel.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 debug = 7 output = /var/log/stunnel4/stunnel.log [5140] client = yes options = ALL accept = 127.0.0.1:5140 connect = xxx.xxx.xxx.xxx:5140
[root@bofh stunnel-4.20]# tail /var/log/syslog May 25 10:57:35 bofh syslog-ng[1926]: EOF occurred while idle; fd='11' May 25 10:57:35 bofh syslog-ng[1926]: Connection broken; time_reopen='60' May 25 10:58:37 bofh syslog-ng[1926]: EOF occurred while idle; fd='11' May 25 10:58:37 bofh syslog-ng[1926]: Connection broken; time_reopen='60' May 25 10:59:38 bofh syslog-ng[1926]: EOF occurred while idle; fd='11' May 25 10:59:38 bofh syslog-ng[1926]: Connection broken; time_reopen='60'