tcpdump can be quite useful for finding malware on a a busy server, where temporarily stopping the traffic will affect many users and thus is not recommended.
Note that it will be only useful if the malware is connecting to some external servers.
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If you ever wanted to use your Postfix with multiple SSL certificates for different domains, here is how.
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If you ever wanted to use your Cyrus IMAP server with multiple SSL certificates for different domains, here is how.
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For some time, large botnet installations have been attacking WordPress installations from many IPs, sometimes the number of attacking addresses was tens of thousands:
In theory, if you use a strong password, you should be safe – but there is one more reason to worry: these kinds of attacks can bring your server to a halt or make it very slow.
Is there any way to protect against it?
Continue reading ‘Protecting WordPress wp-admin / wp-login.php areas against dictionary attacks and DDoS’ »
Debian Wheezy comes with Redmine 1.4.4. If you want to upgrade to Redmine 2.3.x using deb packages, here is how.
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Debian Wheezy comes with PHP 5.4. If this is too new for your application and it doesn’t work properly, here is a short description on downgrading to PHP 5.3.
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If you don’t like the idea of your lxc container to view dmesg output, which includes host’s data, here is a quick tip.
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If you’re using Postfix and Amavis, you may be seeing “Error: queue file write error”, especially with larger than usually email rates.
Here is what you can do to get rid of them.
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If you have a large MySQL dump file, but only need to restore a single table, you may use the following:
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If your server happened to crash, Postgres database is corrupted, but didn’t contain too precious information, you may try the following fix.
The typical symptoms of a corrupted Postgres database would be like below:
Continue reading ‘repairing broken PostgreSQL databases / tables’ »