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Many of these articles are for self-reference. Some are written unedited in the midst of a troubleshooting session. If a few of them appear a bit rough, that’s why.

Postfix – certificate verification failed

Postfix Logo

Another email server issue. Coincidentally, I noticed an error in the maillog when sending to my email address. Mar 2 15:13:40 mail postfix/smtp[28811]: certificate verification failed for mail.xxxxx.ca[144.217.111.73]:25: untrusted issuer /O=Digital Signature Trust Co./CN=DST Root CA X3 As it turned out, there was nothing wrong with the certificate or the issuer on the receiving end. […]

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Android security alert, Stagefright flaw: What to do?

Sick Android

A major security flaw has been discovered in Android operating systems, versions 2.2 & onward; it has been termed Stagefright.¬† Miscreants can take control of affected Android devices simply by sending¬† a specially crafted multimedia text message.¬† Apparently, up to 1 billion devices around the world are at risk. Imagine a scenario where someone takes […]

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