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Replace iRobot Roomba Battery

I have a robot vacuum, iRobot Roomba 551. I can not recall when I bought it. But, I think it is five years old at least 4 or 5 years. I bought it at Costco. Maybe a little bit over $300 at that time. We use it once a [...]
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Upgrade to Calibre 2.66

This time, I upgrade my Calibre installation to 2.66. It is alway an update every week. I would like to track new features in what’s new. The most exciting features added in past eight updates are following: New Features of v2.66 A simplified calibre logo Edit Book: Allow restricting [...]
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Fix the error: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference,

I checked my Nginx log files and saw a lot of errors as below: *11047 FastCGI sent in stderr: “PHP message: PHP Warning: Parameter 1 to W3_Plugin_TotalCache::ob_callback() expected to be a reference, value given in /home/users/yinfor.com/wp-includes/functions.php on line 3597” while reading response header from upstream, I googled it and [...]
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Move to Linode Server

When you saw this post, it means the blog is moved to a new server at Linode. New server is a little bit better than the old one at DigitalOcean. Here is how old server looks like: Operating system     Ubuntu Linux 14.04.4 Kernel and CPU     Linux 3.13.0-88-generic [...]
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5 Free SSL Tools You Must Try in 2016

It is 2016, your website must be SSL encrypted. Now, you have questions, how about my server and how about my SSL installation? This is the answer to this question. You must try these five free tools to test, check, analyse your https website. No.1 SSLShopper It is an [...]
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Add my Blog to HSTS preload list

Now my Blog, David Yin Blog is https encrypted . And it is also HSTS enabled. And latest, it is HSTS preload enabled. It has three layers meaning. https support. HSTS enabled. HSTS preload enabled. Let me explain them one by one. First, add https support. I did this [...]
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[Fixed] OBi110 is not working with Google Voice

Just a few days ago, my OBi110 device does not work with my Google Voice. I can not dial out, and no incoming call, until today, I fixed it. Sometimes it said some configuration error. I sign in my OBiTalk account at https://www.obitalk.com/obinet/ Normally, the device OBi110 can do [...]
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