Unable to connect with openfire installed domain from spark client

Hello,

I have installed open fire in linux.mydomain.com.
I have checked from admin login : xmpp domain and host name was same in server property.

when i try to connect from spark client, I am getting unknown connection error. when i check the log file. i am getting following error.

2018.06.04 05:09:47 WARN [Jetty-QTP-AdminConsole-8983]: org.jivesoftware.admin.LoginLimitManager - Failed admin console login attempt by admin from 94.200.183.6

Much appreciate if any one help me.

Thanks

You should check Spark logs. This error is about bad login attempts to Admin Console, not about Spark.
On Windows logs are here C:\Users\User\AppData\Roaming\Spark\logs

What do you put into Domain field in Spark? If you put linux.mydomain.com, is this name resolvable in the network (either via DNS or other means)?