Admins eHow SysAdmin Tips & Tricks

August 27, 2009

How to clear all iptables rules

Filed under: CentOS,Debian,General,Security — Tags: , , , — admin @ 2:08 pm

In order to flush all iptables rules , Run the following commands :

iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT

How to change windows 2003 administrator password from RDP.

Filed under: General,Security,Windows — Tags: , , — admin @ 6:48 am

In order to connect to a windows VPS remotely , you need to use a software named “Remote Desktop Connection” which is bundled with all versions of windows.
under windows XP it is located under : All Programs –> Accessories –> Communications
under windows Vista it is located under : All Programs –> Accessories
after running this software you will see the following window , enter the IP or host name of your VPS into the computer filed and click on Connect.

after a few seconds a new windows will be opened and you will be asked for the username and password , enter the username and password which is provided by your windows VPS provider. usually the username is Administrator.
if you enter the login details successfully , the desktop of windows VPS will be shown to you.

After you are logged into VPS , follow the below instructions :

Press CTRL+ALT+END buttons simultaneously , the following menu will appear :

Click on Change Password :

Fill the fields and click on OK.

Done 🙂

August 14, 2009

How to Auth pptpd with radius on debian

Filed under: Debian,General — Tags: , , — admin @ 12:54 pm

install libradiusclient-ng2 :

apt-get install libradiusclient-ng2

rename the folder :

 mv /etc/radiusclient-ng/ /etc/radiusclient/

create :

nano /etc/radiusclient/

and copy and paste the following text into it :

#       Microsoft's VSA's, from RFC 2548
#       $Id:,v 1.1 2002/03/06 13:23:09 dfs Exp $

VENDOR          Microsoft       311     Microsoft

ATTRIBUTE       MS-CHAP-Response        1       string  Microsoft
ATTRIBUTE       MS-CHAP-Error           2       string  Microsoft
ATTRIBUTE       MS-CHAP-CPW-1           3       string  Microsoft
ATTRIBUTE       MS-CHAP-CPW-2           4       string  Microsoft
ATTRIBUTE       MS-CHAP-LM-Enc-PW       5       string  Microsoft
ATTRIBUTE       MS-CHAP-NT-Enc-PW       6       string  Microsoft
ATTRIBUTE       MS-MPPE-Encryption-Policy 7     string  Microsoft
# This is referred to as both singular and plural in the RFC.
# Plural seems to make more sense.
ATTRIBUTE       MS-MPPE-Encryption-Type 8       string  Microsoft
ATTRIBUTE       MS-MPPE-Encryption-Types  8     string  Microsoft
ATTRIBUTE       MS-RAS-Vendor           9       integer Microsoft
ATTRIBUTE       MS-CHAP-Domain          10      string  Microsoft
ATTRIBUTE       MS-CHAP-Challenge       11      string  Microsoft
ATTRIBUTE       MS-CHAP-MPPE-Keys       12      string  Microsoft
ATTRIBUTE       MS-BAP-Usage            13      integer Microsoft
ATTRIBUTE       MS-Link-Utilization-Threshold 14 integer        Microsoft
ATTRIBUTE       MS-Link-Drop-Time-Limit 15      integer Microsoft
ATTRIBUTE       MS-MPPE-Send-Key        16      string  Microsoft
ATTRIBUTE       MS-MPPE-Recv-Key        17      string  Microsoft
ATTRIBUTE       MS-RAS-Version          18      string  Microsoft
ATTRIBUTE       MS-Old-ARAP-Password    19      string  Microsoft
ATTRIBUTE       MS-New-ARAP-Password    20      string  Microsoft
ATTRIBUTE       MS-ARAP-PW-Change-Reason 21     integer Microsoft

ATTRIBUTE       MS-Filter               22      string  Microsoft
ATTRIBUTE       MS-Acct-Auth-Type       23      integer Microsoft
ATTRIBUTE       MS-Acct-EAP-Type        24      integer Microsoft

ATTRIBUTE       MS-CHAP2-Response       25      string  Microsoft
ATTRIBUTE       MS-CHAP2-Success        26      string  Microsoft
ATTRIBUTE       MS-CHAP2-CPW            27      string  Microsoft

ATTRIBUTE       MS-Primary-DNS-Server   28      ipaddr  Microsoft
ATTRIBUTE       MS-Secondary-DNS-Server 29      ipaddr  Microsoft
ATTRIBUTE       MS-Primary-NBNS-Server  30      ipaddr  Microsoft
ATTRIBUTE       MS-Secondary-NBNS-Server 31     ipaddr  Microsoft

#ATTRIBUTE      MS-ARAP-Challenge       33      string  Microsoft

#       Integer Translations

#       MS-BAP-Usage Values

VALUE           MS-BAP-Usage            Not-Allowed     0
VALUE           MS-BAP-Usage            Allowed         1
VALUE           MS-BAP-Usage            Required        2

#       MS-ARAP-Password-Change-Reason Values

VALUE   MS-ARAP-PW-Change-Reason        Just-Change-Password            1
VALUE   MS-ARAP-PW-Change-Reason        Expired-Password                2
VALUE   MS-ARAP-PW-Change-Reason        Admin-Requires-Password-Change  3
VALUE   MS-ARAP-PW-Change-Reason        Password-Too-Short              4

#       MS-Acct-Auth-Type Values

VALUE           MS-Acct-Auth-Type       PAP             1
VALUE           MS-Acct-Auth-Type       CHAP            2
VALUE           MS-Acct-Auth-Type       MS-CHAP-1       3
VALUE           MS-Acct-Auth-Type       MS-CHAP-2       4
VALUE           MS-Acct-Auth-Type       EAP             5

#       MS-Acct-EAP-Type Values

VALUE           MS-Acct-EAP-Type        MD5             4
VALUE           MS-Acct-EAP-Type        OTP             5
VALUE           MS-Acct-EAP-Type        Generic-Token-Card      6
VALUE           MS-Acct-EAP-Type        TLS             13

create port-id-map in case it doesnt exists :

echo "" > /etc/radiusclient/port-id-map

edit /etc/radiusclient/dictionary :

nano /etc/radiusclient/dictionary

and add the following lines to the end of it :

INCLUDE /etc/radiusclient/dictionary.merit
INCLUDE /etc/radiusclient/

edit /etc/radiusclient/radiusclient.conf :

nano /etc/radiusclient/radiusclient.conf

copy and paste the following text into it , dont forget to set your own authserver and acctserver:

auth_order      radius
login_tries     4
login_timeout   60
nologin         /etc/nologin
issue           /etc/radiusclient/issue
authserver      AUTH_Server_IP:PORT
acctserver      ACCT_Server_IP:PORT
servers         /etc/radiusclient/servers
dictionary      /etc/radiusclient/dictionary
login_radius    /usr/sbin/login.radius
seqfile         /var/run/radius.seq
mapfile         /etc/radiusclient/port-id-map
radius_timeout  10
radius_retries  3
login_local     /bin/login

edit /etc/radiusclient/servers :

nano /etc/radiusclient/servers

and add the following text into it , change Radius_Server_IP and SecretKey to your own settings :

Radius_Server_IP SecretKey

edit /etc/pptpd.conf :

nano /etc/pptpd.conf

and copy and paste the following text into it , change Server_IP , Remote_IP_From and Remote_IP_TO to your own settings :

option /etc/ppp/pptpd-options
localip Server_IP
remoteip Remote_IP_From-Remote_IP_TO
connections 200

edit /etc/ppp/pptpd-options :

nano /etc/ppp/pptpd-options

and copy and paste the following text into it :

name pptpd
mtu 1200
mru 1200
lcp-echo-failure 50

How to auth ssh users by radius in debian

Filed under: Debian,General — Tags: , , , — admin @ 11:57 am

install libpam-radius-auth

apt-get install libpam-radius-auth

open /etc/pam_radius_auth.conf

nano /etc/pam_radius_auth.conf

and add the following lines into it. Your_IP and PORT are the IP address and Port of Radius sever. SecretKey is the Secret of radius server. 3 is the timeout in seconds.

# server[:port] shared_secret      timeout (s)
YOUR_IP:PORT SecretKey 3

Change the permissions :

chown root /etc/pam_radius_auth.conf
chmod go-rwx /etc/pam_radius_auth.conf

open /etc/pam.d/common-auth :

nano /etc/pam.d/common-auth

and add the following lines :

auth sufficient

August 9, 2009

OPENVPN : read UDPv4 [EHOSTUNREACH]: No route to host (code=113)

Filed under: General — Tags: , , , — admin @ 9:11 pm

I was getting this error on my openvpn server : read UDPv4 [EHOSTUNREACH]: No route to host (code=113)
it seemed to be a network problem , but after a lot of work I found out it is because the time and date of the client side was out dated !
if you are having the same problem please read this post :

August 7, 2009

DirectAdmin installation requirements on CentOS 5

Filed under: CentOS,General — Tags: , , — admin @ 10:00 pm

DirectAdmin guide only asks you to download their setup script and run it , but it doesn’t explain about requires packages before installation , so before installation run the following commands :

yum update
yum install perl gcc gcc-c++ make tar gzip bzip2 diffutils dbus quota

August 5, 2009

Install locate and updatedb on CentOS and Debian

Filed under: CentOS,Debian,General — Tags: , , , , — admin @ 3:55 pm

locate and updatedb commands are the best commands to search and find files in Linux. if you dont have them installed on your Linux , use the following commands :
Debian :

apt-get install locate

CentOS :

yum install mlocate

August 1, 2009

WHCMS 4.x integration with Jrox Affiliate Management System (JAM)

Filed under: General — Tags: , , , — admin @ 7:19 pm

In order to integrate WHMCS 4.x with Jrox Affiliate Management (JAM) system , create a file named jam.php in whmcs/includes/hooks with following content :

function actionhook_InvoicePaid($vars) {
    if (!empty($_COOKIE['jrox'])){
        $result=mysql_query("SELECT * FROM tblorders WHERE invoiceid = '".$vars."' LIMIT 1");
        $row = mysql_fetch_array($result);
		$JAMIntegrate = file_get_contents("".$row['amount']."&trans_id=".$vars."&custom_mid=".$_COOKIE['jrox']);

Make sure to point to your JAM installation URL.

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