SSL client failed to connect

Elastic Stack Logstash
1

Hi,
I have a server running ES & LS versions as follows:-

# rpm -qa | grep -E "logstash|elast
logstash-2.1.1-1.noarch
elasticsearch-2.1.1-1.noarch

And a number of clients running the following beats versions:-

# rpm -qa | grep beat
filebeat-1.0.1-1.x86_64
packetbeat-1.0.1-1.x86_64
topbeat-1.0.1-1.x86_64

When filebeat tries to connect to LS I get the following message:-

Mar  9 15:27:24 fred01 /usr/bin/packetbeat[22959]: transport.go:125: SSL client failed to connect with: read tcp 10.0.1.1:42075->192.168.99.99:5044: read: connection reset by peer
Mar  9 15:27:28 fred01 /usr/bin/topbeat[22990]: transport.go:125: SSL client failed to connect with: dial tcp 192.168.99.99:5044: getsockopt: connection timed out
Mar  9 15:27:28 fred01 /usr/bin/topbeat[22990]: single.go:121: Connecting error publishing events (retrying): dial tcp 192.168.99.99:5044: getsockopt: connection timed out
Mar  9 15:27:28 fred01 /usr/bin/topbeat[22990]: single.go:143: send fail
Mar  9 15:27:28 fred01 /usr/bin/topbeat[22990]: single.go:150: backoff retry: 2s

Where is the problem? On the LS server, the client, or the network in the middle. I can telnet from the client to the LS server on port 5044, but does this prove much?

Any help or pointers would be most welcome.

Thanks, Steve.