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<p class="MsoNormal">Hi All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We use stunnel to send emails from our scanners to our hosted mail provider (that now only accept TLS connections).<o:p></o:p></p>
<p class="MsoNormal">This has been working well for a number of years, but just recently the scanners (all Lexmark) have sporadically been giving errors of ‘connection failed’.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I check the stunnel logs, the failed send has an extra line in of TLS socket closed (SSL_write) with 418 unsent byte(s)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Below are 2 examples, 59 was sent successfully, 60 was not.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">2018.01.16 14:37:24 LOG5[59]: Service [fasthosts-smtp] accepted connection from 10.226.174.95:11473<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:24 LOG5[59]: s_connect: connected 213.171.216.50:465<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:24 LOG5[59]: Service [fasthosts-smtp] connected remote server from 10.226.150.9:52577<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:24 LOG5[59]: OCSP: Connecting the AIA responder "http://t2.symcb.com"<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:24 LOG5[59]: s_connect: connected 23.55.155.27:80<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:24 LOG5[59]: OCSP: Certificate accepted<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:24 LOG5[59]: OCSP: Connecting the AIA responder "http://tj.symcd.com"<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:25 LOG5[59]: s_connect: connected 23.55.155.27:80<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:25 LOG5[59]: OCSP: Certificate accepted<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:25 LOG5[59]: Certificate accepted at depth=0: C=GB, ST=Gloucestershire, L=Gloucester, O=Fasthosts Internet Limited, OU=NOC, CN=smtp.livemail.co.uk<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:37:29 LOG5[59]: Connection closed: 167106 byte(s) sent to TLS, 376 byte(s) sent to socket<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: Service [fasthosts-smtp] accepted connection from 10.226.174.95:11483<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: s_connect: connected 213.171.216.50:465<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: Service [fasthosts-smtp] connected remote server from 10.226.150.9:52620<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: OCSP: Connecting the AIA responder "http://t2.symcb.com"<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: s_connect: connected 23.55.155.27:80<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: OCSP: Certificate accepted<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: OCSP: Connecting the AIA responder "http://tj.symcd.com"<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: s_connect: connected 23.55.155.27:80<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: OCSP: Certificate accepted<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:19 LOG5[60]: Certificate accepted at depth=0: C=GB, ST=Gloucestershire, L=Gloucester, O=Fasthosts Internet Limited, OU=NOC, CN=smtp.livemail.co.uk<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:24 LOG3[60]: TLS socket closed (SSL_write) with 418 unsent byte(s)<o:p></o:p></p>
<p class="MsoNormal">2018.01.16 14:38:24 LOG5[60]: Connection reset: 964 byte(s) sent to TLS, 392 byte(s) sent to socket<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Has anyone come across this before?<o:p></o:p></p>
<p class="MsoNormal">Our mail provider has send limits in place of 50 every 10 minutes, but I am confident we are not reaching those amounts.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any help appreciated.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards, Stephen<o:p></o:p></p>
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