Category Archives: Servers

Windows : How to open a port on firewall from command line (CLI)

Windows Firewall can be configured from the GUI (by using firewall.cpl UI console) and also using the command line. This quick tutorial will cover how to manipulate the rules from CLI to open, block a port and delete a rule. In  a nutshell, here is the command sample:

The rest of this article will… Read More »

Linux : How to clear stuck AutoSSL queue in cPanel

cPanel AutoSSL feature is great, but sometime can run into issues. Once in a while, you may have some certificate requests pending forever without any particular reason. This usually can be fixed by clearing the queue and force AutoSSL to run for the stuck domain again. 1. Move the AutoSSL database file under a different… Read More »

VMware : VCSA upgrade vix error codes = (1, 4294967286)

You may have experienced the following behavior while trying to upgrade your vCenter Server Appliance (VCSA) to 6.7.x – after submitting the IP and credentials information of the current vCenter and host, the wizard end up with error without any details. However, after downloading the log (there is a link within the red error bubble… Read More »

Linux : OSSEC WebUI not showing information after PHP upgrade

You may have noticed that the OSSEC Web Interface stopped working (as of today on a new installation) or after updating PHP on your server. Looking at the logs, you most likely found a similar entry: PHP Fatal error: Uncaught Error: Call to undefined function split() in /var/www/html/ossec/lib/os_lib_agent.php:111\nStack trace:\n#0 /var/www/html/ossec/site/main.php(33): os_getagents(Array)\n#1 /var/www/html/ossec/index.php(126): include(‘/var/www/html/o…’)\n#2 {main}\n thrown… Read More »

Linux : cPanel outgoing email return “this server is not permitted to relay through this server without authentication”

Recently, without any change, I noticed that some cPanel servers stop sending email and return the following error: 550-Please turn on SMTP Authentication in your mail client. 550-hostname.domain.tld [0.0.0.0]:00000 is not permitted to relay 550 through this server without authentication. What is really puzzling in that case is that this message showed up even though… Read More »

Web: ownCloud Transactional file locking should be configured

Getting the following notice from your ownCloud administrator account setting page? Transactional file locking should be configured ownCloud have the capability of managing file/folder locking on its own, on top of the filesystem. This is a must-have feature especially for large, busy, multi-users servers, and especially when users use their account on multiple devices. You… Read More »

Linux : cPanel The service “imap” appears to be down

Encountering the following issue with Dovecot/IMAP service on your cPanel server lately? The service “imap” appears to be down Reason TCP Transaction Log: << * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID ENABLE IDLE NAMESPACE LITERAL+ STARTTLS AUTH=PLAIN AUTH=LOGIN] Dovecot ready. >> A001 LOGIN __cpanel__service__auth__imap__nJl5Hcz7gc9iiv1r V0TeDQVaynp8zl9g << * BYE Internal error occurred. Refer to server log… Read More »