Linux HOW To’s !!!

Apache Server Status & Error Codes !!!

Successful Client Requests
200 OK
201 Created
202 Accepted
203 Non-Authorative Information
204 No Content
205 Reset Content
206 Partial Content

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Open DNS servers
1) Go to http://www.dnsreport.com/tools/dnsreport.ch?domain=mydomain.com
2) Check for BIG RED “FAIL” (7th box, going down from up) saying “Open DNS servers”.
If you see the message, you can correct it the following way:
1) login to your server as root
2) nano -w /etc/named.conf (if you are running Bind)
3) Look for // query-source address * port 53; [...]

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Mod_Evasive will help to stop basic attacks on a server (HTTP, DDoS attack and brute force attack). Detection is performed by creating an internal dynamic hash table of IP Addresses and URIs, and denying any single IP address from any of the following:
-Requesting the same page more than a few times per second
-Making more than [...]

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To create a self-signed certificate, you can use the following commands :
mkdir -p /etc/ssl/private
openssl req -x509 -nodes -newkey rsa:1024 -keyout \
/etc/ssl/private/pure-ftpd.pem \
-out /etc/ssl/private/pure-ftpd.pem
chmod 600 /etc/ssl/private/*.pem

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Optimizing host.conf
#!/bin/sh
cp /etc/host.conf /etc/host.back
echo “# Lookup names via DNS first then fall back to /etc/hosts.” > /etc/host.conf
echo “order bind,hosts” >> /etc/host.conf
echo “# We have machines with multiple IP addresses.” >> /etc/host.conf
echo “multi on” >> /etc/host.conf
echo “# Check for IP address spoofing.” >> /etc/host.conf
echo “nospoof on” >> /etc/host.conf

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