I have two e107 sites (both v2 version). I want to use alt auth plugin for users that are already registered on older site. Is this correct setting?

Is this mean that first is checked actual database, then older one? I wasn't able to set it in reversed order - at first check older site (other e107 db) then new one (e107).
Thanks
Ok, so nothing again with alt auth plugin.
@Moc maybe I should change title - there is bug too, password checking doesn't work
@Jimmi08 Done :) It's on my list to test but I need some more time. Maybe this weekend.
@Moc Thank you! I understand it could be difficult with 2 different systems, but it should work with 2 the same version of e107 at least.
Also, it won't work with PHP7 in it's current state.
@Jimmi08 Please try with e107 salted again. I found an issue in the code which should correct it.
@CaMer0n
I tried. Not know if only with 2 e107 dbs or general, but I tried both.
I wasn't able to connect server (e_PDO set true). I tried Test functionality in admin area.
Authentication failed - could not connect to DB / service provider
Cannot connect to remote DB; PDOException message: SQLSTATE[HY000] [2005] Unknown MySQL server host 'mariadb55.websupport.sk:3310' (2)
The instructions for PDO connect on my server are:
Example of use in PHP scripts with PDO connection
parameters are in order ("server+port/socket;database_name", "login", "password")
Recommended connection (works everywhere):
$connection = new PDO("mysql:host=mariadb55.websupport.sk;port=3310;dbname=database_name", "login", "here_insert_password");
It could be related with this: https://github.com/e107inc/e107/issues/794
After rewritting it worked before (before my moving to other server - I am back now - and changes in password managing).
@Jimmi08 What's the status on this one?
Available ALT options:
e107 is added to primary sources list manually.
No idea, why can't be used as a secondary source. e107db is external/other e107 database,
There is parameter for this in alt_auth_get_authlist(), but e107 is added manually only to primary source.
https://github.com/e107inc/e107/pull/4002/commits/9889ad5e993231387b0f0a6f1ec06ac65ff6ec30
Duplicate:
https://github.com/e107inc/e107/issues/3983
It's the same problem. No idea what plans were for this.
Closing this one.
Most helpful comment
@Moc Thank you! I understand it could be difficult with 2 different systems, but it should work with 2 the same version of e107 at least.