Connecting plugin to SOLR

Hi,

I am new to wordpress, I have installed SOLR 4.5 and 3.6 on my centOS machine on 8983 and 8984 port respectively. I can access both the SOLR using https://local host:8983/SOLR and https://localhost:8984/SOLR, but when I am trying to connect this plugin to SOLR using check SOLR setting button it is not working, neither giving any error.

Can anyone suggest what I am doing wrong or is there any logs which I can see.

Thanks in advance ??

https://www.ads-software.com/plugins/advanced-search-by-my-solr-server/