I have an old quickbuild server on Ubuntu. The server is configured with a dns name like qb.mnx.net. Now as per requirement, I have changed the ip address of the server and the domain name for quickbuild is also changed. So I changed configuration from server UI "Administration->System settings->URL to Access quickbuild" from http://qb.mnx.net to http://101.105.201.45. After that I restarted the server.
The issues are:

1. When i download buildagent from the server, I noticed that the build agent still using the old domain name of the server. The node.properties file still contains the old url.
2. After quickbuild server restart, the value of URL to access quickbuild goes back to the old url

Requesting support to resolve these issues.