Oracle Database Discussions

I try to update the database parameter max_connections (see view v$archive_dest)

I am able to set the parameter in data guard:
EDIT DATABASE 'database' SET PROPERTY 'MaxConnections'=2;

But my database does not take over this parameter.

I stop dataguard, stopped the db and tried different scenarios. But at startup the log_archive_dest is still set with the old parameter max_connections=1;

Whats the correct way of modyfing this values ?

I can´t update it by: alter system set - because the strings contains more than 255 characters.

Also I tried to create a pfile from spfile - modified the log_archive_dest_x - -started the db using this pfile and created a new spfile.
Shutdown - startup --> old value;

So, how to change this parameter ?