A method for a secure connection to an application run on a server from a client computer device, by a user who does not have the authentication data of the account declared in said application, said account comprising at least one identity ID proxy,application and associated authentication data, implementing a proxy comprising a memory for recording, for each user declared by a primary account comprising at least one identity ID user, the list of the targets C resources,accounts which said user has access to, with the method comprising the following steps: - opening, by the user, of a connection with the proxy by means of a multichannel native administration protocol, with a first identity ID user for the opening of a primary multichannel session, - simultaneous or sequential definition of the application, - connection of the proxy to the server hosting said application selected using the same multichannel native administration protocol with a second identity ID proxy,user to open a secondary multichannel session, - temporary recording of a piece of information I relay corresponding to the link between said primary session and said secondary session - running, on the server, of a computer code opening a channel between said server and said proxy, as part of said secondary multichannel session, - sending, using said code, on said channel, of a request, requesting, for said application and said account, the authentication data - in response to this request, transmission, by the proxy, of the authentication data if the target defined by said application and said account belongs to the list of targets C resources,accounts, associated with an identifier ID proxy,application recorded for said user, - and running of said application and transmission to said application, using said code, of the user data or error notification if the account does not belong to said list. - opening, by the user, of a connection with the proxy by means of a multichannel native administration protocol, with a first identity ID user for the opening of a primary multichannel session, - simultaneous or sequential definition of the application, - connection of the proxy to the server hosting said application selected using the same multichannel native administration protocol with a second identity ID proxy,user to open a secondary multichannel session, - temporary recording of a piece of information I relay corresponding to the link between said primary session and said secondary session - running, on the server, of a computer code opening a channel between said server and said proxy, as part of said secondary multichannel session, - sending, using said code, on said channel, of a request, requesting, for said application and said account, the authentication data - in response to this request, transmission, by the proxy, of the authentication data if the target defined by said application and said account belongs to the list of targets C resources,accounts, associated with an identifier ID proxy,application recorded for said user, - and running of said application and transmission to said application, using said code, of the user data or error notification if the account does not belong to said list.