I come back again inside this error and I realize when odoo try to load any backend page it launchs a GET request to web/webclient/translations. 

The url is like this: web/webclient/translations/8b5c07deec1503efe607b2a8d1296b83ef775ddc?mods=base%2Cweb%2Cmuk_session_store%2Cbase_setup... where here there are all the installed modules and the last param is the current lang (&lang=es_ES). 

So, I count the number of characters and if this request is longer than 5850 characters, then I get an ERR_CONECTION_CLOSED in Chrome and just nothing happens in Firefox (but doesn't load the page) and, as I said in past messages, simply the execution stops and log doesn't show any error. When I uninstall some modules to reduce this number, then it loads successfully.

This is an odoo conf error? A server error? What should I do?

Thanks.

Hi,
Can you ensure the modules are available in the addons path and see if there is some information's in the browser console.

Thanks