host_config:
  "testserver":
    sql_type: mssql
    sql_server: "localhost_azure_server_name"
    sql_database: "db_name"
    sql_username: "test"
    sql_password: "test123"
    auth_method: [sql]

ejabberdctl register "testuser" "localhost" "passw0rd"

2016-09-02 15:00:18.233 [error] <0.508.0>@ejabberd_auth:is_user_exists:316 The authentication module ejabberd_auth_sql returned an error
when checking user <<"testuser">> in server <<"testserver">>
Error message: {timeout,{p1_fsm,sync_send_event,[<0.386.0>,{sql_cmd,{sql_query,{sql_query,<<"Q9525209">>,#Fun<sql_queries.9.38301790>,#Fun<sql_queries.10.38301790>,#Fun<sql_queries.11.38301790>,{sql_queries,145}}},123131},60000]}}