Thread ID: 2457798 : SqlCollector connection refused:

Thread ID: 2457798 : SqlCollector connection refused:

Hi everyone,
I'm testing Exchange Reporter Plus. I had an error on Skype reporting.

Unable to establish Skype for Business 2015 SQL Server backend connection

I checked the error log SkypeLog_2021-03-10.txt and see: 

[16:31:35:942]|[03-10-2021]|[SkypeLogger]|[INFO]|[2457798]: Thread ID: 2457798 : SqlCollector connection refused: jdbc:jtds:sqlserver://sfbAOListener.domainname.com:1443;useLOBs=false;instance=MSSQLSERVER;databaseName=LcsCDR;DOMAIN=domainname;useNTLMv2=true|
[16:31:35:942]|[03-10-2021]|[SkypeLogger]|[INFO]|[2457798]: Thread ID: 2457798 : SqlCollector ends : query_id: 21|

But there is no any problem with connecting to SQL Server, i installed sql management studio on the same machine and tested: connected successfully but the application gets error.

Any ideas?
thanks in advance