From NetFlix Tech Blog: Tuning Tomcat For A High T…

Posted on July 28, 2015 by richard

From NetFlix Tech Blog: Tuning Tomcat For A High Throughput, Fail Fast System. techblog.netflix.com/2015/07/tuning…

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“it is unlikely that there will be a technological…

Posted on July 27, 2015 by richard

“it is unlikely that there will be a technological singularity in this century” timdettmers.wordpress.com/2015/07/27/bra…

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Much needed Linux IPv6 path from Facebook. https:/…

Posted on July 27, 2015 by richard

Much needed Linux IPv6 path from Facebook. code.facebook.com/posts/11238823…

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Good info on how/what happens when the Linux kerne…

Posted on July 27, 2015 by richard

Good info on how/what happens when the Linux kernel gets compiled. github.com/0xAX/linux-ins…

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Our new Shop site gives discounts for quarterly, 1…

Posted on July 26, 2015 by richard

Our new Shop site gives discounts for quarterly, 1/2 yearly & yearly subscriptions for our OZC VPS Plans at shop.networkpresence.com.au #NetPres

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12% off coupon via OzBargain for our new range of…

Posted on July 26, 2015 by richard

12% off coupon via OzBargain for our new range of OZC VPS Plans out of our main Data Centre in Sydney. ozbargain.com.au/node/203515 HT @ozbargain

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IBM acquires Compose. https://t.co/1ns36EgeiI “Com…

Posted on July 23, 2015 by richard

IBM acquires Compose. compose.io/articles/compo… “Compose will be part of the Cloud Data Services (CDS) group”

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Fascinating series of Designing a CPU in VHDL (par…

Posted on July 23, 2015 by richard

Fascinating series of Designing a CPU in VHDL (part 6). labs.domipheus.com/blog/designing…

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Our good friends at Rising Sun Pictures in Adelaid…

Posted on July 21, 2015 by richard

Our good friends at Rising Sun Pictures in Adelaide are looking for a Project Developer. See rsp.com.au/projectdevelop…

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TLS/SSL config updates to Sendmail for recent OpenSSL versions

Posted on July 21, 2015 by richard

Recent SSL updates to the OpenSSL package have removed old DH parameters which are built into Sendmail mail server software, so the following are configuration updates to Sendmail (sendmail.cf) to enable the use of a longer DH Parameter to TLS/SSL activity of Sendmail.

First, create a longer DH Parameter file with:

openssl dhparam -out /etc/pki/tls/certs/dhparams.pem 1024

Then configure the use of this dhparams.pem file into sendmail.cf with the following added to the ‘Options’ section of your sendmail.cf file:

O DHParameters=/etc/pki/tls/certs/dhparams.pem

And then restart sendmail after making that sendmail.cf update.

This should remove TLS/SSL based email sending errors, which have maillog entries like:

STARTTLS=server: 1867:error:14094417:SSL routines:SSL3_READ_BYTES:sslv3 alert illegal parameter:s3_pkt.c:1092:SSL alert number 47

FYI,
Richard.

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