1、The first case
First, make sure the server is connected to the internet is normal, login to the CTI server to ping update.astercc.org, if not connect astercc update server, please check network availability.
2、The second case
Modify the CTI server’s MTU value.
2.1 Temporarily change the MTU value of the CTI server and take effect immediately:
echo "1430" > /sys/class/net/eth0/mtu
You can use ifconfig to see the results of your changes.
2.2 Permanently changes the MTU value of the CTI server and takes effect immediately:
Use vi to edit the /etc/sysconfig/network-scripts/ifcfg-eth0 file, increase MTU = "1430", and then execute
service network restart for the settings to take effect.