Ldap authentication NOT closing connections properly

We configured Grafana to use LDAP authentication and we are seeing the below “Client Connection Aborted” message in the LDAP server logs. Why is the connection NOT closing properly?
Can you pl. assist?

[05/Apr/2018:20:25:00 -0400] conn=2950107 op=-1 msgId=-1 - closing from 148.93.96.18:18995 - A1 - Client aborted connection -
[05/Apr/2018:20:25:26 -0400] conn=2950268 op=-1 msgId=-1 - closing from 148.93.96.18:9696 - A1 - Client aborted connection -