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: netsh advfirewall firewall add rule name=”<DESCRIPTION>” dir=in… Read More »
Red Hat introduced “Cockpit” starting with version 8 of their operating system. For that matter, they have added a banner at login that suggest how to enable it as followed: Activate the web console with: systemctl enable –now cockpit.socket If you have no business using it, you might want to get rid of that banner… Read More »
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 »
If you encounter error 0x80092004 while installing updates on Windows 7 or Server 2008 R2, it is most likely due to some cryptography issues (CRYPT_E_NOT_FOUND). To workaround this problem, you need to manually install the following update(s) : SHA-2 code signing support update for Windows Server 2008 R2, Windows 7, and Windows Server 2008: September… Read More »
R1Soft backup may fail in some circumstances, even though no change occurred, the agent and kernel hcp module properly installed with message that the replication driver was not detected as shown below : 8/26/20 5:14:58 PM Error Protected Machine An exception occurred during the request. The replication driver was not detected (detail: An error occurred… Read More »
If you are accessing a computer using Remote Desktop (RDP) and try ripping an optical media (DVD, BD) using MakeMKV (or any other similar software for that matter), it will fail to access the disk. With MakeMKV, the error message will be as followed : The program can’t find any usable optical drive. This error… Read More »
Attempting to use the SAR (sadc) command to lookup the historical system resources consumption metrics and got the following message? Cannot open /var/log/sysstat/sa27: No such file or directory Please check if data collecting is enabled Most likely data collecting is disabled (it is the default on several systems). You need to enable data collecting and… Read More »
If you are experiencing issues with your local mail aliases, make sure there is no syntax error in /etc/aliases file and have a look at the mail log file : /var/log/mail.log You most likely will encounter a message like this one : postfix/local[15083]: warning: database /etc/aliases.db is older than source file /etc/aliases In that case,… 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 »