I am a contributor to the Drupal community and a Drupal engineer for SPI. This is a bare-bones Drupal 8 site I set up to record things I learn. Many times, I’ve had to learn something a second time because I didn’t keep notes the first time. I hope to fix that by keeping notes here. I also hope the notes help you, whether you’re learning something for the first, the second, or the hundredth time.

.htaccess in home directory brought down all my sites

Submitted by Darren Oh on Tue, 07/19/2016 - 16:13

This afternoon, most of the sites running on my computer started responding with “500 Internal Server Error”. The Apache error log showed the following error:

[Tue Jul 19 16:17:01.418642 2016] [core:alert] [pid 79692] [client] /Users/darren/.htaccess: <IfModule not allowed here

Moving keys from Bitcoin Core to MultiBit wallet on Mac

Submitted by Darren Oh on Mon, 07/04/2016 - 12:37

The Bitcoin block chain had reached 85 gigabytes last week, so it was no longer practical to run a full node client on my laptop. A full node client verifies a transaction by checking earlier transactions all the way back to when the network first issued the funds used in the current transaction. To do this, it first has to download every block of transactions in the chain. The alternative is a client that uses simplified payment verification (SPV).

Getting Netflix to bypass IPv6 tunnel

Submitted by Darren Oh on Sun, 06/05/2016 - 18:38

Bright House Networks does not support IPv6, so I use the the Hurricane Electric IPv6 Tunnel Broker service to reach the IPv6 Internet. Last Wednesday night, Netflix started showing an error message when I tried to play movies: “You seem to be using an unblocker or proxy. Please turn off any of these services and try again.” Netflix customer support first said my access was blocked because my IPv6 address came from a different state. I switched to a tunnel in my own state, but Netflix still blocked me.

Connecting MySQL Workbench to Acquia database

Submitted by Darren Oh on Tue, 05/10/2016 - 17:24

I’ve been able to connect to an Acquia database before from MySQL Workbench 6.2.4 on OS X, but today I was getting an error:

Could not connect the SSH Tunnel

Authentication error, unhandled exception caught in tunnel manager, please refer to logs for details

To see the logs, go to Help » Show Log File. The relevant log file is wb.log, and the error message is

SSHException: Incompatible ssh peer (no acceptable kex algorithm)

I selected Help » Check for Updates, and was told,

SQL statement to get value from row containing max value

Submitted by Darren Oh on Tue, 04/05/2016 - 11:56

I was trying to get a list of highest numbered records from an SQL database table. My first attempt used a GROUP BY and an aggregate function:

SELECT * FROM field_data
GROUP BY revision_id
HAVING delta = MAX(delta)

This means to only return records which contain the highest delta values their revision IDs. I know SELECT statements are only supposed to have fields which appear in the GROUP BY clause, but I tried it just in case. The HAVING filter had no effect. My second attempt used a join:

El Capitan Airplay Mirroring Issue

Submitted by Darren Oh on Fri, 02/12/2016 - 10:46

When I tried to use Airplay to make my TV a second display, the TV went blank. None of the mirroring options were shown in the Airplay menu. I called Apple support, but Airplay mysteriously started working during the call. Yesterday, the problem was back. I found the solution in an Apple support community post. There seems to be a bug in El Capitan that prevents Airplay from being used as a second display if there is an invalid login item.