When your server fails to contact the license server, it may be an easy fix on your end. Please check the following before you log a ticket.
To check your DNS, run:
ping gooogle.com
Does it return the right result? (Don't try to ping our license server since it is not allowed.)
~> ping google.com PING google.com (172.217.12.206) 56(84) bytes of data. 64 bytes from lga25s63-in-f14.1e100.net (172.217.12.206): icmp_seq=1 ttl=128 time=10.1 ms 64 bytes from lga25s63-in-f14.1e100.net (172.217.12.206): icmp_seq=2 ttl=128 time=11.3 ms 64 bytes from lga25s63-in-f14.1e100.net (172.217.12.206): icmp_seq=3 ttl=128 time=12.5 ms
If your DNS is ok, you can try to telnet to our license server by using port 443. Try license and/or license2.
telnet license.litespeedtech.com 443 telnet license2.litespeedtech.com 443
~> telnet license.litespeedtech.com 443 Trying 35.171.237.73... Connected to license.litespeedtech.com. Escape character is '^]'. ^] telnet> quit Connection closed.
If you see the above, it means your server can connect to LiteSpeed's license server without any problem.
Run the following curl commands:
curl -I -k https://license.litespeedtech.com curl -I -k https://license2.litespeedtech.com
~> curl -I -k https://license.litespeedtech.com HTTP/1.1 404 Not Found Date: Tue, 05 Jun 2018 18:54:16 GMT Accept-Ranges: bytes Server: LiteSpeed Alt-Svc: quic=":443"; ma=2592000; v="35,37,38,39" Connection: Keep-Alive
If you see the above, it means your server connected to the license server without any problem. Don't worry about “404 Not Found”. It is normal.
Check if there's any IPv6 DNS nameserver. Our license server does not like IPv6 mapped IPv4 addresses.
cat /etc/resolv.conf
nameserver 62.50.161.166 nameserver 217.149.113.30 nameserver 2620:0:ccc::2 nameserver 2620:0:ccd::2 nameserver 2001:4860:4860::8888
If so, comment out the IPv6 server records and try to verify license again.
nameserver 62.50.161.166 nameserver 217.149.113.30 #nameserver 2620:0:ccc::2 #nameserver 2620:0:ccd::2 #nameserver 2001:4860:4860::8888
If your server can connect to the license server without any problem but it still returns “failed to contact license server”, most likely your datacenter blocks the license server. You will need to contact your service provider to fix it.
If you would like to add our license server IPs to whitelist, you can add whatever the following resolved to:
license.litespeedtech.com license2.litespeedtech.com
At the time is writing, they are 34.231.236.27 and 167.99.112.67, but they may be changed and you will need to check IPs yourself to make sure.