I have read all forums and no definitive answers to this

Hi, I have read all forums and no definitive answers to this issue “There was a connection problem. Please check the URL and Key of the Master site.” I will include log files with domain names stared out. It mentions something about key being wrong but I copy/paste 20 times and still nothing but error. Please Help.

Sub-Domain.log [2014-05-07 02:36:35][M] 0-10 – ajax actions***

[2014-05-07 02:36:35][M] 07 – added new sub site***

[2014-05-07 02:36:48][M] 02 – sending request – url=http://www.**sub-domain**.com/wp-admin/admin-ajax.php?action=user_sync_api;;***

[2014-05-07 02:36:49][M] 03 – sending request – response=0ac2201f9198bbccf2d8ba65a92f5d23;;***

[2014-05-07 02:36:49][M] 06 – checking key false;;***

Master-Domain.log

[2014-05-07 02:36:34] 01 – new subsite conection – central_url=http://**Master-Domain**.com;; replace_user=1;; overwrite_user=1;;***

[2014-05-07 02:36:34] 02 – sending request – url=http://**Master-Domain**.com/wp-admin/admin-ajax.php?action=user_sync_api;;***

[2014-05-07 02:36:35] 03 – sending request – response=

ok;;***

[2014-05-07 02:36:49] 0-10 – ajax actions***

[2014-05-07 02:43:50] 01 – new subsite conection – central_url=http://**Master-Domain**.com;; replace_user=1;; overwrite_user=1;;***

[2014-05-07 02:43:50] 02 – sending request – url=http://**Master-Domain**.com/wp-admin/admin-ajax.php?action=user_sync_api;;***

[2014-05-07 02:43:51] 03 – sending request – response=

ok;;***