[stunnel-users] Problem with name resolving on Centos 7

Tue Feb 12 12:04:54 CET 2019

Hello,

I've installed stunnel-4.56-6.el7.x86_64 on my Centos 7. I can't
establish a connection. Seems to be something wrong with the name
resolution, because if I use the IP derect, the tunnel works.

Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526436416]:
Service [cs] accepted (FD=3) from 127.0.0.1:10866
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Service [cs] started
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Waiting for a libwrap process
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Acquired libwrap process #0
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Releasing libwrap process #0
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Released libwrap process #0
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Service [cs] permitted by libwrap from 127.0.0.1:10866
Feb 12 11:58:00 server stunnel[52445]: LOG5[52445:139984526432000]:
Service [cs] accepted connection from 127.0.0.1:10866
Feb 12 11:58:00 server stunnel[52445]: LOG3[52445:139984526432000]:
Error resolving 'foobar.remote.site': System error returned in errno
(EAI_SYSTEM)
Feb 12 11:58:00 server stunnel[52445]: LOG3[52445:139984526432000]: No
host resolved
Feb 12 11:58:00 server stunnel[52445]: LOG5[52445:139984526432000]:
Connection reset: 0 byte(s) sent to SSL, 0 byte(s) sent to socket
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Local socket (FD=3) closed
Feb 12 11:58:00 server stunnel[52445]: LOG7[52445:139984526432000]:
Service [cs] finished (0 left)

stunnel.conf:
socket = r:TCP_NODELAY=1
socket = l:TCP_NODELAY=1
options = CIPHER_SERVER_PREFERENCE
TIMEOUTclose = 0
sslVersion = TLSv1
options = NO_SSLv2
options = NO_SSLv3
client = yes
options = DONT_INSERT_EMPTY_FRAGMENTS
cert       = /etc/stunnel/stunnel.pem
key        = /etc/stunnel/stunnel.pem
debug = 7
chroot = /var/run/stunnel
setuid = stunnel
setgid = stunnel
pid    = /stunnel.pid
fips   = no
[srvice]
accept = 63123
connect = foobar.remote.site:63123
delay = yes

Any suggestions are very welcome!

Thanks in advance
Tom