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Attacks by ZmEu or w00tw00t robots

Who is ZmEu?

An image showing ZmeuThe name Zmeu (no capital E) is the name of a fantastic creature of Romania. There are so many stories that there isn't a clear understanding of what it is... but it is human like, can spit fire and wants to marry young women.

If you're wondering, it is generally a bad guy.

ZmEu Attack

Today, I noticed a lot of traffic on one of my servers. Looking into what was happening, I immediately found out that an attacker was looking for a loophole in that system. That attack was being performed from China.

Google understands the "Allow:" keyword in robots.txt

At times you have to prevent users from seeing files under a certain folder such as the /admin/ or /wp-admin/ folder.

The easiest way to at least avoid having Google index those pages is to add a Disallow line in your robots.txt file. For example:

Disallow: /admin
Disallow: /wp-admin

This is great and 99% of the time it does exactly what you want. Only once in a while a programmer does it wrong and places a file that should be searchable under such folders. For example, maybe someone placed a style.css file which is access by pages other than just pages under /admin. In that case, the ...

stream_socket_client() fails with no errors...

Today I had a weird one.

The PHP function named stream_socket_client(), used to create a socket to communicate with another computer over a network, may return $errno = 0 and $errstr = "".

The PHP reference actually mentions the problem:

On failure the errno and errstr arguments will be populated with the actual system level error that occurred in the system-level connect() call. If the value returned in errno is 0 and the function returned FALSE, it is an indication that the error occurred before the connect() call. This is most likely due to a problem initializing the socket. ...

Desktop Google Calendar now defaults to Agenda because I have it on my Android...

Since I got my Android phone earlier this year, I got a huge problem with Google Calendar.

I use the calendar mainly on my Desktop. Big screen, easy to read and use. But on the Android, the format is Agenda to make it possible to use at all.

Somehow that has a really bad side effect: the display is now always forced to Agenda on my Desktop too. Really annoying!

Tere is actually a very easy fix! It took me months the discover it and it's actually very easy.

I have the Calendar link bookmarked so I can just click one button to get it open.

All I had to do is add the following anchor at ...

Wordpress 2017 -- how do you get a summary in your Category and other lists?

I now also work on a Worpress website with theme 2017 (twentyseventeen) and I noticed that when I go to the Caegories or some other list of posts, I get the full posts.

Looking into it, I could not really see anything about it on the Internet. Strange.

The fact is that all you have to do is go back to each post (yeah, a tad bit tedious if you have hundreds already) and add the "Read more mark". The fact is that Wordpress does not seem to automatically add a feature to automatically calculte the summary of your posts. Maybe I missed it or I would need to install yet another plugin.. ...

REST hook trigger needs a polling url (ZSE007)

As I'm working on a Zap application (see Zapier). I got this error about my triggers:

REST hook trigger needs a polling url (ZSE007)

So... I understand that they want to have a URL to do a poll and they even have documentation that explains why they want to poll in case of a REST hook Zap: Whenever the user wants to test the Zap, the application will get some data using the polling method. That way they can get that data specifically for one test and not force you to generate an trigger. One problem with testing with an actual trigger is that any other Zap listening to the same trigger ...

Why would Windows 8 lose my WiFi connection all the time?

The laptop I use runs MS-Windows 8.1, because a few software I have only run on that platform... It uses the WiFi to connect to my LAN. This is how I access the Internet, too.

Only once in a while (very often, if you ask me!), my WiFi would go out. This started to happen more or less when I switched from AT&T to Comcast. I did not really see what could possibly be different and all my other computers would continue to work just fine, including those used with WiFi too.

Many people say that your WiFi is bad or that you should change your WiFi Router... Or maybe when the laptop goes ...

My Embedded YouTube Video Disappeared

Embedded videos from YouTube.com used to work just fine on my website.

Today, though, I just noticed that my video was not showing up on one of my pages. Looking into it, I found out that the problem was the protocol.

I'm not too sure whether it was my browser or YouTube,com (although I'm not too sure how YouTube.com would know...) but the fact is that the iframe source was using HTTP and the page I was viewing used HTTPS.

By editing the page and changing the YouTube.com video from HTTP to HTTPS resolved the issue. It is generally much better to always use encryption anyway.

Why are hotmail.com emails blocked by postgrey even though it is whitelisted?

Lately, I received emails from a customer something like 12 hours later...

So I checked closer and could see that the email was from hotmail.com.

Great.

On the server, I edited my whitelist to see what was going on:

vim /etc/postgrey/whitelist_clients.local

Searching the list I could see hotmail.com, so why is it that it gets bounced with a 450 by Postgrey if it is whitelisted?

Looking closer at the logs left behind by Postgrey, I found this line:

Apr 23 06:33:34 m2osw postgrey[1742]: action=greylist,
      reason=new,
      client_name=<secret>.outlook.com,
      ...

SugarCRM Community Edition for Ubuntu 16.04 with PHP 7

As I wanted to use SugarCRM on my new server, I looked into the Community Edition and apparently the company is not willing to convert their code so it works under PHP 7.

So that would not work on a newer system because the code uses quite a few forbidden mechanism (wrong class definitions, old defunct functions...) and that prevents to even instal the system on your machine.

Now, I have looked closer into it and I am getting a version that works pretty darn well already. I still have some issues here and there, but I think you can already make use of that version. Except for one thing which ...

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