"Reconnect <node> retries exceeded" error while enabling n2n encryption

Build 6.5.0-4837

Observed that while enabling node to node encryption following error is thrown-

Turned on encryption for node: http://172.23.96.100:8091

ERROR: _ - Reconnect to 'ns_1@172.23.96.106' retries exceeded

Note that out of 10 runs we saw this error 8 times, with reconnect to different nodes failing.

Command used to enable node to node encryption-

/opt/couchbase/bin/couchbase-cli node-to-node-encryption --enable --cluster 172.23.96.100:8091 -u Administrator -p password

Here are details of one of run where we see this error-

Job- http://perf.jenkins.couchbase.com/job/titan-reb-dev/90/

Logs-
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.100.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.101.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.102.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.103.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.104.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.105.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.106.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.107.zip
https://cb-jira.s3.us-east-2.amazonaws.com/logs/reconnect_error/collectinfo-2019-11-20T060144-ns_1%40172.23.96.108.zip
 
In older builds like 6.5.0-4647, we don't used to see this often.