Issue: Require numerically organizing a long list of IP addresses using the Notepad++ application Solution: Use Regex expressions in the “replace” feature of this application. Step 1 Open the replace dialogue. Please be sure to switch the Search Mode to “Regular expression” (by default the search mode is “normal”). Search for: Replace with: Step 2 … Read more
Issue: Configure CentOS server to ignore pings. Ping is useful to would-be attackers, who use it to identify systems. Configuring systems to ignore pings, may help them maintain a more hidden disposition, it is not a certain tool to eliminate attacks. In fact, it can disrupt someone trying to troubleshoot network connectivity. Solution: Use sysctl … Read more
Issue: A user is unable to access their email, instead they receive a message as the example below: Unexpected condition from IMAP server, closed or corrupt connection to IMAP. Possible mailbox corruption. Often this is the result of a corrupt dovecot.index file. Server logs located at /var/log/maillog will likely display lines such as the below: … Read more