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Why does Port 9721 intermittently refuse connections on Apache Tomcat 8.5 running on Windows Server 2012 R2?

Web Server: Apache Tomcat 8.5
Operating System: Windows Server 2012 R2
Port: 9721
We are running a Web server on our internal network and have about 8500 kiosks connecting through our VPN to a Java servlet that is running on this port: <Server IP Address>:9721
This Web server was set up by a former employee and we are not sure how it was originally configured.
We noticed recently that about 25% of the connection attempts are being refused (Connection Refused error). We found this information by monitoring Port 9721 using PRTG and this monitoring tool is reporting that this port is refusing connections on multiple occasions within each hour throughout the day. I have not been able to find a pattern to the refused connections...it appears to be intermittent.
Our network administrator says it is not a firewall issue, but I have not ruled out this possibility. We have tried to review the "maxconnections" setting in the Tomcat server.xml configuration file, but cannot find the "maxconnections" attribute included in that configuration file. We do not have the Tomcat Manager Application installed on this server that I can find.
How do I troubleshoot and resolve this port connection issue?

server application wildfly(jboss)

Hi everyone I search in forum and google but I don't have response.
When I run server application Wildfly(Jboss) I have this error:
Deploying on WildFly Application Server
profile mode: false
debug mode: false
force redeploy: true
Starting WildFly Application Server
WildFly Application Server Start Failed. HTTP Connector port 8080 is already in use.
thanks for hepl.

Weblogic 10.3 can not be accessed after enableing Administrator port

I was was following this blog to set up some SSL connection. One-Way SSL with JAX-WS using JDeveloper 11gR1 and WLS 10.3.1
One of the steps mentioned is to enable the Administration port from weblogic console. I did that and change the Admin port. But, after saving everything get missed up the conclose closed and the I could not run the application form Jdeveloper .
The Error message is:
User 'principals=[weblogic, Administrators]' has administration role. All tasks by adminstrators must go through an Administration Port.
**** Authentication error while connecting to application server IntegratedWebLogicServer. Please check settings.
**** Failed to complete start-up of application server IntegratedWebLogicServer.
[Server Instance IntegratedWebLogicServer is shutting down. All applications currently running will be terminated and undeployed.]
[Forcing termination of IntegratedWebLogicServer]
taskkill /F /PID 7480
Process exited.
This blog: SOA OIM integration and WebLogic administration port
discuss this issue BUT under the assumption that I can access the weblogic console. But it is not happening for me.
I am using Jdeveloper 11.1.1.7 and the weblogic 10.3

The problem solved by deleting the system files for jdeveloper. This action will re insinuate the weblogic server. This file is located in my case in the following path: C:\Users\[UserName goes here]\AppData\Roaming\JDeveloper.
Check this thread form Oracle community for more information : Authentication error while connecting to application server IntegratedWebL

Remote connection of Jboss 7 server fails with Proxy exception

I have a Jboss 7 server running & accepting secure connections on port 443.
All along i was testing locally which was working fine . However now when i make connection attempts i get a
"javax.naming.NamingException: Failed to create proxy [Root exception is java.lang.IllegalStateException: ..." .
I tried to follow what is written # EJB invocations from a remote client using JNDI
I guess my jndi.properties & jboss-ejb-client.properties file need changes . I think i got it right but still no success .
1 ) jndi.properties
java.naming.factory.url.pkgs=org.jboss.ejb.client.naming
2 ) jboss-ejb-client.properties
remote.connectionprovider.create.options.org.xnio.Options.SSL_ENABLED=false
remote.connections=default
remote.connection.default.host=10.160.148.61
remote.connection.default.port = 4447
remote.connection.default.connect.options.org.xnio.Options.SASL_POLICY_NOANONYMOUS=false
Any suggestions anyone . Making the port 443 also doesnt help .
My ejb call from the client
InitialContext aJNDI = new InitialContext();
Ppi handle = (Ppi) aJNDI
.lookup("ejb:PPIEAR/PService/PConnect!com.gem.p.PConnection?stateful");
Posting Full stracktrace :
log4j: Finished configuring.
- JBoss EJB Client version 1.0.5.Final
- XNIO Version 3.0.3.GA
- XNIO NIO Implementation Version 3.0.3.GA
- JBoss Remoting version 3.2.3.GA
- Could not register a EJB receiver for connection to remote://10.160.148.61:4447
java.lang.RuntimeException: Operation failed with status WAITING
at org.jboss.ejb.client.remoting.IoFutureHelper.get(IoFutureHelper.java:93)
at org.jboss.ejb.client.remoting.ConfigBasedEJBClientContextSelector.setupEJBReceivers(ConfigBasedEJBClientContextSelector.java:121)
at org.jboss.ejb.client.remoting.ConfigBasedEJBClientContextSelector.<init>(ConfigBasedEJBClientContextSelector.java:78)
at org.jboss.ejb.client.EJBClientContext.<clinit>(EJBClientContext.java:77)
at org.jboss.ejb.client.EJBClient.createSession(EJBClient.java:160)
at org.jboss.ejb.client.naming.ejb.EjbNamingContext.doCreateProxy(EjbNamingContext.java:135)
at org.jboss.ejb.client.naming.ejb.EjbNamingContext.createEjbProxy(EjbNamingContext.java:113)
at org.jboss.ejb.client.naming.ejb.EjbNamingContext.lookup(EjbNamingContext.java:96)
at javax.naming.InitialContext.lookup(Unknown Source)
..

Quoting this page:
WARN: Could not register a EJB receiver for connection to
remote://10.160.148.61:4447 java.lang.RuntimeException: Operation failed
with status WAITING
This is commonly caused by a wrong combination of IP or port in the file jboss-ejb-client.properties.
You might be unable to reach that host address
Maybe you are using a port-offset on that server, so instead of port 4447 you should use 4447 + offset
You could start by testing if you can connect to your target using telnet:
telnet 10.160.148.61 4447

Eclipse Tomcat Depolyer plug in error

I downloaded Tomcat Deployer
so i could deploy remotely to my tomcat server, when insert all the correct details it ask for such as:
Manager URL
Username/Password
URL of sync App
when i try to deploy i keep getting this error:
Failed to deploy: com.caucho.hessian.client.HessianRuntimeException: java.net.ConnectException: Connection refused: connect
Projecct [HFJSe] deploy completed.
And nothing is deployed.
If there anything i need to do on my Tomcat server?

The error states that the target machine is refusing the connection, so you'll need to check the following information:
The URL is correct (I know you've stated it, but the URL should be in the format of http://{host}:{port}/TomcatHelper (from what I understand in the documentation)
That if there is a configuation file, that the port is configured appropriately
The target server has that port open to accepting connections
Your username and password is correct
If your "remote" server is on the same local machine, use your loopback address (i.e. localhost