Avocent DSR8020 KVM/IP - Network Connect Error - Solution
This error is commonly due to Java security or TLS settings but there is a second issue with forwarded ports that also causes it.
1. Java Security/TLS Settings issue:
This article has the solution to change them all in Linux automatically
2. Port Forwarding Issue if your Avocent DSR is behind NAT/private IP........
iptables port forwarding multiple ports to another IP
iptables -t nat -A PREROUTING -p tcp -m multiport --dports 80,443,2068,8192 -j DNAT --to-destination 192.168.1.175
Just adjust the "--dports" to the ports you need and the --to-destination to the destination IP (note it must be on the same network as the server running iptables
Here's an example of forwarding an IP on the main machine of a single port to another one on the LAN:
#enable web server connection
iptables -t nat........
iptables howto multiport forward in single line example
-A PREROUTING -p tcp -m multiport --dports 10000,18080,13306 -j DNAT --to-destination 192.168.5.83........
iptables centos error getsockopt failed strangely: Invalid argument
iptables -t nat -A PREROUTING -p udp -m multiport --dports 20,123,443 -j REDIRECT --to-port 53
getsockopt failed strangely: Invalid argument........