OpenVPN CRL has expired
VERIFY ERROR: depth=0, error=CRL has expired: CN=servername
In order to fix the issue, we just need to recreate the crl.pem file.
we need to backup the current crl.pem file before creating a new one.
The location of the crl.pem file at /etc/openvpn/
#mv crl.pem crl.pem.back
Now go to easy-rsa folder
# cd easy-rsa
now generate crl.pem
# ./easyrsa gen–crl
Now copy the new crl.pem to openvpn folder
# cp –pr /etc/openvpn/easy–rsa/pki/crl.pem
Now restart openvpn service
source link :- https://www.jobishmathew.me/openvpn-crl-has-expired/
To troubleshoot connection issues check below logs
grep the client name in /var/log/messages
# grep VPN /var/log/messages
Check the connection time
Check the connection negotiation activity
# tail -f /var/log/messages
How to install vos3000 126.96.36.199 on CentOS 6.X
Follow the steps
#chkconfig iptables off
#chkconfig ip6tables off
Continue reading How to install vos3000 188.8.131.52 on CentOS 6.X
VMware OS Optimization Tool
The VMware OS Optimization Tool helps optimize Windows 7/8/2008/2012/10 systems for use with VMware Horizon View. The optimization tool includes customizable templates to enable or disable Windows system services and features, per VMware recommendations and best practices, across multiple systems. Since most Windows system services are enabled by default, the optimization tool can be used to easily disable unnecessary services and features to improve performance.
You can perform the following actions using the VMware OS Optimization Tool:
- Local Analyze/Optimize
- Remote Analyze
- Optimization History and Rollback
- Managing Templates
Download latest VMware OS Optimization Tool
SSH Login Email Alerts
The examples below send an email when someone logs into your server. For this to work, your server must be able to send mail using the
Open the file
~/.bash_profile in a text editor.
Append the following lines:
IP="$(echo $SSH_CONNECTION | cut -d " " -f 1)"
NOW=$(date +"%e %b %Y, %a %r")
echo 'Someone from '$IP' logged into '$HOSTNAME' on '$NOW'.' | mail -s 'SSH Login Notification' YOUR_EMAIL_ADDRESS
iptables port forwarding
I am port forwarding public ip x.x.x.x to private ip 192.168.200.200 .
iptables -A INPUT -i eth0 -p tcp –dport 5001 -m state –state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -o eth0 -p tcp –sport 5001 -m state –state ESTABLISHED -j ACCEPT
iptables -t nat -A PREROUTING -i eth0 -p tcp -m tcp –dport 5001 -j DNAT –to-destination 192.168.200.200:5001
Continue reading iptables port forwarding
How to configure Cisco Unity Connection with CUCM with SCCP
I will be configuring very simple way without CSS and Partition with Default Basic Configuration.
Below are the Call flow From CUCM and Cisco Unity Connection.
Continue reading How to configure Cisco Unity Connection with CUCM with SCCP
How to configure UCCX Simple Auto Attendant
I am going to configure UCCX and CUCM for simple Auto Attendant using inbuilt script (aa.aef) in Cisco UCCX. I am not making any restriction so I am not using CSS and Partition to make it very simple .
we need to go through following steps .
- Creating UCCX Call Control Group (CTI Ports in CUCM)
- Adding UCCX Script Application
- Adding UCCX Trigger (CTI Route Point in CUCM)
- Make a Test Call to Auto Attendant
Before going above steps UCCX basic configuration should be done as AXL, JTAPI and RMCM integration. As it is the POST UCCX configuration after installation .
Continue reading How to configure UCCX Simple Auto Attendant
How to configure MGCP on Cisco Router and CUCM
To configure MGCP on Cisco Router and CUCM below are the steps
1- Configure E1 or T1 Port to work with MGCP
2- Configure Router for MGCP to register on CUCM
For step 1
Follow the link http://www.gkhan.in/configure-cisco-router-t1-mgcp/
mgcp call-agent 192.168.100.11 service-type mgcp
mgcp bind control source-interface FastEthernet0/0.110
mgcp bind media source-interface FastEthernet0/0.110
mgcp dtmf-relay voip codec all mode out-of-band
Continue reading How to configure MGCP on Cisco Router and CUCM
How to configure Cisco Router T1 for MGCP
Below steps checked on Cisco 2811 and 2911 Routers
1- Check the VVIC location
NAME: “2811 chassis”, DESCR: “2811 chassis”
PID: CISCO2811 , VID: V05 ,
NAME: “VWIC2-1MFT-T1/E1 – 1-Port RJ-48 Multiflex Trunk – T1/E1 on Slot 0 SubSlot 0“, DESCR: “VWIC2-1MFT-T1/E1 – 1-Port RJ-48 Multiflex Trunk – T1/E1”
Show inventory command shows you the location installed VVIC card in our case it is installed on Cisco Router Slot 0.
Continue reading How to configure Cisco Router T1 for MGCP