When I am trying to start Apache server from Eclipse, I am getting message as:
Several ports (8085, 8009) required by Tomcat v6.0 Server at localhost are already in use. The server may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s).
I find the ports are opened by any process by the OS using "netstat -an"
I found below data as listening.
TCP 0.0.0.0:8009 0.0.0.0:0 LISTENING
TCP 0.0.0.0:8080 0.0.0.0:0 LISTENING
TCP 0.0.0.0:8085 0.0.0.0:0 LISTENING
TCP [::]:8009 [::]:0 LISTENING
TCP [::]:8080 [::]:0 LISTENING
TCP [::]:8085 [::]:0 LISTENING
I don't know whether this are useful process, or can I release this ports.
If tomcat is already running eclipse will report this. This could happen if eclipse crashed.
If you only have one instance of tomcat on your machine
Try stopping it
bin/shutdown.sh
or on windows
bin/shutdown.bat
and then restarting tomcat from eclipse.
On linux
You can verify those ports are in use by another tomcat (or the same one that is already running) with
netstat -anp #running as the superuser the -p option will say what the process is
You can then check the process table to cross reference the ports
ps aux | grep java
or
ps aux | grep 1234 #replacing 1234 with the PID reported by netstat
If it is tomcat and it won't shutdown after running bin/shutdown.sh then you can kill it using the kill commmand.
If you do have something else that is using those ports
edit conf/server.xml
change the ports that tomcat will use, try 6080, 6005, etc
start tomcat from eclipse again
Related
I have 3 computers 2 Linux and 1 Windows.
Windows PC and Linux server (A) are on the same network (1).
The linux server (B) is on another network (2).
I want to make an SSH tunnel between the 2 linux servers to allow the Windows PC to access an HTTP page of the Linux server (B), which is therefore on another network.
With this command on the linux server (A) the tunnel works fine but only locally in linux.
ssh -R 8080:localhost:80 linuxa.internet.com
But from Windows PC I cannot access port 8080 on linux (A). http://linuxa.local:8080 does not work.
So I tried these two commands to open access to my PC but it doesn't work either.
ssh -R 0.0.0.0:8080:localhost:80 linuxa.internet.com
ssh -R ipwindows:8080:localhost:80 linuxa.internet.com
Can you help me ?
Thank you
From a comment, I conclude that you might have problem with the firewall. Suppose you can reach the tunnel from the host that is "proxy" (with curl,wget,ncat etc. on localhost). You should check what block traffic. In most cases, it is a firewall. Depending on your Linux distro you might have different backends and frontends for a firewall. If you have firewall-cmd command installed it's very likely that firewalld is one.
But before blaming the firewall, you should check if a port is open/closed. I prefer netcat:
HOST_THAT_SHOULD_HAVE_OPEN_PORT # nc -l 8080
HOST_THAT_SHOULD_BE_ABLE_TO_CONNECT # nc HOST_THAT_SHOULD_HAVE_OPEN_PORT 8080
If there is no connection or connection is refused, it's extremely likely that the firewall is the problem.
You can check if firewalld is running with systemctl:
# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
Active: active (running) since Mon 2021-02-08 21:42:29 CET; 13h ago
Then you might add traffic on port 8080:
# firewall-cmd --add-port 8080/tcp
success
It will temporarily open network traffic on 8080. Then you should be able to use port 8080 and your ssh tunnel.
Thank you for your answer but I don't think I have a firewall installed
systemctl status firewalld
return
Unit firewalld.service could not be found.
and
firewall-cmd --add-port 8080/tcp
-bash: firewall-cmd: command not found
My apache services are working on solaris server. It will be running normally for days but suddenly it hangs. httpd will shown process running but telnet localhost will not connect.
telnet localhost will only connect if you are running a local telnet server...I believe Sun started turning that off by default in Solaris 10.
telnet localhost 80 will try to connect to port 80, where your Apache server might be running. But many Apache configurations are not set to listen on localhost. Instead, try telnet XXX 80, where XXX is the IP number that Apache is listening on. You can see a list of the IP addresses on your current zone with ifconfig -a.
If Apache really IS hanging, you are going to need to gather more information, like
what happens when you telnet into it
what is the output of netstat -an | grep LISTEN | grep '\*\.80'
does it start working again when you HUP the main process (look for the pid which is the parent of all the others)
what is in the main Apache error_log?
Apache is extremely stable, and if it's hanging, you likely have a either an astable plugin, or somehow you are consuming too many of some resource (like you have a 1000-child limit and 1000 people doing http long poll or something)
I installed apache server on my computer...
I want to simulate how the server works in order to test my code.
After instllation when I run it, i got this message:
I couldn't find what cause this problem.
EDIT: this is what I see...
How do I srart the server? How do I "upload" my code to it?
You have something using port 80.
1) Start the prompt
Start menu -> Run -> Type cmd.exe
or
"Windows button" + R -> Type cmd.exe .
or
2) Follow instructions below
netstat -ano
Example result (my OS is Swedish so I translated the headings so it might not match 100%):
Active connections
Proto Local address Remote address Status PID
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING 932
TCP 0.0.0.0:445 0.0.0.0:0 LISTENING 4
TCP 0.0.0.0:623 0.0.0.0:0 LISTENING 7896
TCP 0.0.0.0:3389 0.0.0.0:0 LISTENING 1384
TCP 0.0.0.0:5357 0.0.0.0:0 LISTENING 4
TCP 0.0.0.0:7779 0.0.0.0:0 LISTENING 4
TCP 0.0.0.0:7800 0.0.0.0:0 LISTENING 4
And check the list to see if you have another server running.
The last column is the PID. Check it in task manager or any other way you like.
First stop the Apache server, then start it again. It looks like you already started the server, and again try to start
03:32:35[Apache]Problem detected!
03:32:35[Apache]Port 80 in use by "Unable to open process" with PID 4!
03:32:35[Apache]Apache WILL NOT start without the configured ports free!
03:32:35[Apache]You need to uninstall/disable/reconfigure the blocking application
03:32:35[Apache]or reconfigure Apache and the Control Panel to listen on a different port
03:32:35[Apache]Attempting to start Apache app...
03:32:35[Apache]Status change detected: running
As log said, Port 80 is already used by another process
to check wich process use port :
WINDOWS: netstat -a -b
LINUX : sudo netstat -tulpn (must run with root)
To change the port of Apache, you have to modify this file:
APACHE_INSTALLATION_PATH/conf/httpd.conf and change this configuration Listen 80 to the port you want to use, example : Listen 8085
N.B: in your browser you must type this url http://www.mywebsite.com:8085 instead of http://www.mywebsite.com ( == http://www.mywebsite.com:80)
You must restart your apache server
I think that skype is using port 80, but i'm not sure
What ports does RabbitMQ Server use or need to have open on the firewall for a cluster of nodes?
My /usr/lib/rabbitmq/bin/rabbitmq-env is set below which I'm assuming are needed (35197).
SERVER_ERL_ARGS="+K true +A30 +P 1048576 \
-kernel inet_default_connect_options [{nodelay,true}] \
-kernel inet_dist_listen_min 35197 \
-kernel inet_dist_listen_max 35197"
I haven't touched the rabbitmq.config to set a custom tcp_listener so it should be listening on the default 5672.
Here are the relevant netstat lines:
tcp 0 0 0.0.0.0:4369 0.0.0.0:* LISTEN 728/epmd
tcp 0 0 0.0.0.0:35197 0.0.0.0:* LISTEN 5126/beam
tcp6 0 0 :::5672 :::* LISTEN 5126/beam
My questions are:
for other nodes to be able to connect to the cluster, do all 3 ports 4369, 5672 and 35197 need to be open?
Why isn't 5672 running on tcp and not just tcp6?
PORT 4369: Erlang makes use of a Port Mapper Daemon (epmd) for resolution of node names in a cluster. Nodes must be able to reach each other and the port mapper daemon for clustering to work.
PORT 35197
set by inet_dist_listen_min/max Firewalls must permit traffic in this range to pass between clustered nodes
RabbitMQ Management console:
PORT 15672 for RabbitMQ version 3.x
PORT 55672 for RabbitMQ pre 3.x
Make sure that the rabbitmq_management plugin is enabled, otherwise you won't be able to access management console on those ports.
PORT 5672 RabbitMQ main port (AMQP)
PORT 5671 TLS-encrypted AMQP (if enabled)
For a cluster of nodes, they must be open to each other on 35197, 4369 and 5672.
For any servers that want to use the message queue, only 5672 (or possibly 5671) is required.
What ports is RabbitMQ using?
Default: 5672, the manual has the answer. It's defined in the RABBITMQ_NODE_PORT variable.
https://www.rabbitmq.com/configure.html#define-environment-variables
The number might be differently if changed by someone in the rabbitmq configuration file:
vi /etc/rabbitmq/rabbitmq-env.conf
Ask the nmap if it can see it:
sudo nmap -p 1-65535 localhost
Starting Nmap 5.51 ( http://nmap.org ) at 2014-09-19 13:50 EDT
Nmap scan report for localhost (127.0.0.1)
Host is up (0.00041s latency).
PORT STATE SERVICE
443/tcp open https
5672/tcp open amqp
15672/tcp open unknown
35102/tcp open unknown
59440/tcp open unknown
Oh look, 5672, and 15672
Ask netstat if it can see it:
netstat -lntu
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:15672 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:55672 0.0.0.0:* LISTEN
tcp 0 0 :::5672 :::* LISTEN
Oh look 5672.
lsof to see ports:
eric#dev ~$ sudo lsof -i | grep beam
beam.smp 21216 rabbitmq 17u IPv4 33148214 0t0 TCP *:55672 (LISTEN)
beam.smp 21216 rabbitmq 18u IPv4 33148219 0t0 TCP *:15672 (LISTEN)
use nmap from a different machine, find out if 5672 is open:
sudo nmap -p 5672 10.0.1.71
Starting Nmap 5.51 ( http://nmap.org ) at 2014-09-19 13:19 EDT
Nmap scan report for 10.0.1.71
Host is up (0.00011s latency).
PORT STATE SERVICE
5672/tcp open amqp
MAC Address: 0A:40:0E:8C:75:6C (Unknown)
Nmap done: 1 IP address (1 host up) scanned in 0.13 seconds
Try to connect to a port manually with telnet, 5671 is CLOSED:
telnet localhost 5671
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
Try to connect to a port manually with telnet, 5672 is OPEN:
telnet localhost 5672
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Check your firewall:
sudo cat /etc/sysconfig/iptables
It should tell you what ports are made open:
-A INPUT -p tcp -m tcp --dport 5672 -j ACCEPT
Reapply your firewall:
sudo service iptables restart
iptables: Setting chains to policy ACCEPT: filter [ OK ]
iptables: Flushing firewall rules: [ OK ]
iptables: Unloading modules: [ OK ]
iptables: Applying firewall rules: [ OK ]
To find out what ports rabbitmq uses:
$ epmd -names
Outputs:
epmd: up and running on port 4369 with data:
name rabbit at port 25672
Run these as root:
lsof -i :4369
lsof -i :25672
More about epmd options.
Port Access
Firewalls and other security tools may prevent RabbitMQ from binding to a port. When that happens, RabbitMQ will fail to start. Make sure the following ports can be opened:
4369: epmd, a peer discovery service used by RabbitMQ nodes and CLI tools
5672, 5671: used by AMQP 0-9-1 and 1.0 clients without and with TLS
25672: used by Erlang distribution for inter-node and CLI tools communication and is allocated from a dynamic range (limited to a single port by default, computed as AMQP port + 20000). See networking guide for details.
15672: HTTP API clients and rabbitmqadmin (only if the management plugin is enabled)
61613, 61614: STOMP clients without and with TLS (only if the STOMP plugin is enabled)
1883, 8883: (MQTT clients without and with TLS, if the MQTT plugin is enabled
15674: STOMP-over-WebSockets clients (only if the Web STOMP plugin is enabled)
15675: MQTT-over-WebSockets clients (only if the Web MQTT plugin is enabled)
Reference doc:
https://www.rabbitmq.com/install-windows-manual.html
Check \AppData\Roaming\RabbitMQ\log. If you have a log file there search for started TCP listener on [::].
It should tell you on which port rabbitMq is running. Look for the last entry.
Disclaimer: not the best way to find port, as there might be a chance the port has been changed in the mean time.