Swarm clients do not connect after Jenkins master restart

[Christopher Ladd]

We have Jenkins master version 1.565.3 and Jenkins swarm plugin version 1.24 and when we perform a restart of our Jenkins master, our clients cannot connect.  They all show up, but then never establish a connection.  It should be noted that we have about 30 slaves trying to connect after the restart.  Has anyone else seen this problem?  I have not seen any documentation regarding the limitation of swarm clients.  Our Jenkins master has plenty of resources so I am not sure why we are having this issue.  The master is in AWS and most of the slaves are Linux docker slaves or Linux ec2 slaves.