i have upgraded my netxms from the first version i've installed (1.1.6) to the latest (1.2.5). After upgrade, i decide to install the web interface, so i use the command:
"sh ./configure --nxhttpd".
Then i see the login screen, but when i insert username and password i got the error "server uses incompatible communication protocol".
This kind of error message appear when you use the incorrect version of console, so it seems like if is installed an incorrect version of the webgui.
I have not installed the web gui when i use the version 1.1.6, maybe it's this that cause the problem.

i can recover a backup in wich i use 1.1.6 version, so i have the follow idea:

install the webui with the 1.1.6 version, then upgrade all (server,agent, webui) to 1.2.5.

There is another way to install the webui directly to 1.2.5?

Thank you