Monthly Archives: March 2017

Partial DNS resolver failure – how to fix

You came here probably because you are receiving email messages from cPanel with a subject : “[yourhostcom] ⚠ Partial DNS resolver failure”.  Such emails look like:

This indicates an issue with the DNS resolvers from the file /etc/resolv.conf. So we need to remove it.

We recommend the use of the Google DNS servers – 8.8.8.8 and 8.8.4.4. More info at https://developers.google.com/speed/public-dns/. You should also talk with your web host.

To edit the file etc/resolv.conf you need to login to your server as “root”. The file contains now:

nameserver 127.0.0.1
nameserver 8.8.8.8

After removing the first line and adding the second Google server, it will be:

nameserver 8.8.8.8
nameserver 8.8.4.4
It’s very probable that you will receive such messages again after the server restart. These messages are due to the fact you are on a virtual environment and you are using a DNS system (like PowerDNS) which does not provide a caching nameserver.
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How to list domains with DNSSEC

This tutorial applies to a cPanel server with PowerDNS installed

To list the domains on your server that are configured with DNSSEC (Domain Name System Security Extensions) you need to login as root and execute the following command:

pdnssec list-secure-zones

The result will be something like:
root@web [~]# pdnssec list-secure-zones
Mar 08 15:52:08 [bindbackend] Done parsing domains, 0 rejected, 12 new, 0 removed
yourdomain1.com
yourdomain2.com
All secure zonecount:1
root@web [~]#

yourdomain1.com, yourdomain2.com etc are the domains that uses DNSSEC.
You can go ahead and list the key details for a domain with DNSSEC. Just use the command:
pdnssec show-zone yourdomain1.com
For example, for our domain demo.plothost.com, the info is:

root@web [~]# pdnssec show-zone demo.plothost.com
Mar 08 13:04:11 [bindbackend] Done parsing domains, 0 rejected, 463 new, 0 removed
Zone is not presigned
Zone has NARROW hashed NSEC3 semantics, configuration: 1 0 7 78326f1db1405ff2
keys:
ID = 3 (KSK), tag = 57434, algo = 8, bits = 2048        Active: 1 ( RSASHA256 )
KSK DNSKEY = demo.plothost.com IN DNSKEY 257 3 8 AwEAAaZVe21ROtKfWtzQrB2tPd4kP0+cautYOsgbWtPkHy6l0WBDcXQFRennP/uJIDsbfdDkjP1l4SrdpOM5NI01CtE6QTvHDA32L4Z8L9N5qmQ+YkAe+Vk09tNQVKYMfiN/sMA4xQIHQ8KAvky4jMn+fr2k6WvE/QyQPtjYAEoXt1uOiGCSFE7njCx9maikt/WT5YrZEQ5ncJjzzPU3IGdznlJc2sDV+NXbDHVqjH0Bd0GlIp7l/2Io5sAcnlusvi2u5Dawa1aLidfNyLIlmEmzqy98djDFD8vu627E9zmZ74M0YCBbfD6oRpmmXj1SRkc+GhIFN2HvqnkJyf/k1gvG2ms= ; ( RSASHA256 )
DS = demo.plothost.com IN DS 57434 8 1 49708717a42d565c741fe3d6ece70d648c8a6d7b ; ( SHA1 digest )
DS = demo.plothost.com IN DS 57434 8 2 c255d52f2386a15b8e3181a6596b47d0b96911bf044c55e6df6c3387294b3150 ; ( SHA256 digest )
DS = demo.plothost.com IN DS 57434 8 4 716c0d1c8b33bd01e8beb218924abf62e7ac531c056e073ad2dec2720bc4e57a693f18af75a410484ca1438208c0390e ; ( SHA-384 digest )

ID = 4 (ZSK), tag = 1318, algo = 8, bits = 1024 Active: 1 ( RSASHA256 )
root@web [~]#

 

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International Women’s Day 2017 Google doodle

Today is the International Women’s Day. For this year Google presents 13 of the past doodles honoring great women in the history.
“This International Women’s Day, we’ve chosen to look to the past to celebrate some of the female pioneers who paved the way to where we are today.” says the Google Doodle post.

You can see below the carousel that appears when you search for “International Women’s Day” on google.com website, as of March 8, 2017.

Here are the thirteen images shared by Google (we linked each woman name with her corresponding Wikipedia page):

Ida Wells

Lotfia El Nadi

Frida Kahlo

Lina Bo Bardi

Olga Skorokhodova

Miriam Makeba

Sally Ride

Halet Çambel

Ada Lovelace

Rukmini Devi

Cecilia Grierson

Lee Tai-young

Suzanne Lenglen

You can read more details at the International Women’s Day 2017.

We wish you a Happy Women’s Day!

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WordPress 4.7.3 Security Release

WordPress just released version 4.7.3. This is security update and you should update your blog(s) as soon as possible.

Security issues that were fixed in version 4.7.3:

– Cross-site scripting (XSS) via media file metadata.
– Control characters can trick redirect URL validation.
– Unintended files can be deleted by administrators using the plugin deletion functionality.
– Cross-site scripting (XSS) via video URL in YouTube embeds.
– Cross-site scripting (XSS) via taxonomy term names.
– Cross-site request forgery (CSRF) in Press This leading to excessive use of server resources.

Also, WordPress version 4.7.3 contains 39 maintenance fixes.

If you need any help updating your WordPress installation please submit a ticket and we’ll be happy to help.
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