Error Starting ZooKeeper Server: "Address Already in Use"

Engine start-up fails after running the start.sh|bat script. Although port 2181 is free

While attempting to start the ZooKeeper server using the start.bat command with the -p <password> -s all,

2024-11-14 15:51:17,675 [myid:] - INFO [main:o.a.z.s.q.QuorumPeerConfig@177] - Reading configuration from: C:\appian243\appian\services\conf\zookeeper.properties
...
2024-11-14 15:51:18,707 [myid:0] - INFO [main:o.a.z.s.NIOServerCnxnFactory@660] - binding to port 0.0.0.0/0.0.0.0:2181
2024-11-14 15:51:18,711 [myid:0] - ERROR [main:o.a.z.s.ZooKeeperServerMain@91] - Unexpected exception, exiting abnormally
java.net.BindException: Address already in use: bind
at java.base/sun.nio.ch.Net.bind0(Native Method)
at java.base/sun.nio.ch.Net.bind(Net.java:555)
at java.base/sun.nio.ch.ServerSocketChannelImpl.netBind(ServerSocketChannelImpl.java:337)
at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:294)
at java.base/sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:89)
at java.base/sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:81)
at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:662)
at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:160)
at org.apache.zookeeper.server.ZooKeeperServerMain.initializeAndRun(ZooKeeperServerMain.java:113)
at org.apache.zookeeper.server.ZooKeeperServerMain.main(ZooKeeperServerMain.java:68)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:141)
at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:91)
2024-11-14 15:51:18,713 [myid:0] - INFO [main:o.a.z.a.ZKAuditProvider@42] - ZooKeeper audit is disabled.
2024-11-14 15:51:18,717 [myid:0] - ERROR [main:o.a.z.u.ServiceUtils@48] - Exiting JVM with code 1