If you attempted to merge cells together within a table in Microsoft Excel, you may have faced the grayed out “Merge and Center” button issue. To work around this problem, do the following : 1. Select the cells that you want to merge 2. Right click on the selection 3. In the context menu, click… Read More »
If you changed the hostname/FQDN of a Linux server, you may end up with some issues, especially with mailing if some areas were forgotten with that change. Here is a quick procedure involving all the steps you should be looking for. (The following example is based on a Debian Linux system running Postfix MTA.) 1.… Read More »
This symptom occurred all of a sudden with Nmap 7.80 and Windows 10 version 1909 (OS build 18363.836), where nmap tries to query using interface “eth0” : Starting Nmap 7.80 ( https://nmap.org ) at 2020-06-30 11:28 Eastern Daylight Time dnet: Failed to open device eth0 QUITTING! It seems that latest Windows updates is involved in… Read More »
OpenVPN enforce by default a 15 minutes lockout policy for unsuccessful login attempts. As an avid system administrator and used to end-user struggles, you most likely encountered many times situations where a user tried to log in 20 times and blaming you that it isn’t working (all that because they are entering the wrong password,… Read More »
Having the following login error attempting to establish a RDP session to a Windows server or workstation? The requested session access is denied. The following behavior apply to your case: The user you are using is a part of the Remote Desktop Users group (or allowed to the RDP users) The user is a non-administrator… Read More »
By default, OpenVPN has 15 minutes timeout lockout policy for consecutive unsuccessful authentication attempt (whatever you are using Local, PAM or LDAP authentication). If you want to change it to shorter or longer time period, follow these easy steps below : 1. Push the new timeout value to the configuration using this command (this example… Read More »
Almost 10 years ago, VMware released “VMware Installation Bundle”, or commonly known as VIB, to make it easier for 3rd party and administrators to install software components to their flagship virtualization platform, vSphere ESXi. The process is quite straight forward and you usually can’t go wrong if you are installing the right VIB for the… Read More »
If you ever experienced the “Google Chrome Black Screen of Death”, where the whole window is just black, and persisting even after rebooting your computer (works well for a short period of time and then go black again), here is the possible cause and solution below. In most of the cases, this is due to… Read More »
Experiencing the following error loading a Web site hosted on your cPanel server? 503 Service Unavailable And observing the following errors in the Apache logs :
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1 2 |
[proxy_fcgi:error] [pid 00000] [client 0.0.0.0:42284] AH01079: failed to make connection to backend: httpd-UDS [proxy:error] [pid 00000] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /opt/cpanel/ea-php70/root/usr/var/run/php-fpm/26d213f9ae943ceebe3b32afb7f1f0936a2eaf04.sock (*) failed |
In my case, this occurred after the Web site account was just migrated to a new server. This is related to PHP-FPM, that isn’t responding to serve the… Read More »
Encountering the following log event on your Juniper MX router? fpc0 qsfp-0/0/0 failed to init hw This could be caused by various factors, such as : Defective FPC Defective PIC Defective transceiver Incompatible transceiver* *I have observed this error on customer equipment when DAC cables were used. The Juniper MX series does not officially support… Read More »