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Port trigger – How to set up

Port trigger – How to set up – Super User

linux – Do ephemeral port numbers run in sequence for the whole system, per process or per listening port?

We have an application and we use the ephemeral port number to identify the connection. We listen on two different ports, one for normal connections and one for SSL connections. I want to avoid the situation where the port numbers clash because the OS is assigning the ephemeral port numbers per listening port instead of per process or across the system as whole.

We are hosting on Windows but would like the option to switch to linux at some stage.

ssh single port foward on multiple machines, possible?

I have to showcase a grafana dashboard to a group of familiar strangers. There is no VPN. Screencast is not interactive enough.

My idea is to set up a single linux user ‘demo-user’ and share the password for this user with the group. From there, everyone can create a port forward from their machine, to port 3000 on my machine.

The result would be +-50 machines running ssh -L 3000:grafana-server.example.com:3000 demo-user@jumphost.example.com to view the dashboard on their localhost:3000.

Apart from bandwidth issues, would this be possible? Are there better alternatives?

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docker – psycopg2.OperationalError: could not connect to server: No route to host Is the server running on host “db” and accepting TCP/IP connections on port

Following the instructions here was fine on openSUSE Tumbleweed with Docker version 20.10.6-ce, build 8728dd246c3a

https://github.com/mirumee/saleor-platform#how-to-run-it

But on openSUSE Leap 15.3 with Docker version 19.03.15, build 99e3ed89195c the migrate command (last command) throws an error:

$ git clone https://github.com/mirumee/saleor-platform.git --recursive --jobs 3
$ cd saleor-platform
$ docker-compose build
$ docker-compose run --rm api python3 manage.py migrate

Error

psycopg2.OperationalError: could not connect to server: No route to host
Is the server running on host “db” (172.21.0.4) and accepting
TCP/IP connections on port 5432?

Error log

m3@localhost:~/repos/saleor-platform> docker-compose run --rm api python3 manage.py migrate
Creating network "saleor-platform_default" with the default driver
Creating network "saleor-platform_saleor-backend-tier" with driver "bridge"
Creating saleor-platform_jaeger_1 ... done
Creating saleor-platform_db_1     ... done
Creating saleor-platform_redis_1  ... done
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
    self.connect()
  File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 200, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 187, in get_new_connection
    connection = Database.connect(**conn_params)
  File "/usr/local/lib/python3.8/site-packages/psycopg2/__init__.py", line 127, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: could not connect to server: No route to host
        Is the server running on host "db" (172.21.0.4) and accepting
        TCP/IP connections on port 5432?


The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python3.8/site-packages/django/core/management/__init__.py", line 395, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 330, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 371, in execute
    output = self.handle(*args, **options)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/base.py", line 85, in wrapped
    res = handle_func(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/core/management/commands/migrate.py", line 92, in handle
    executor = MigrationExecutor(connection, self.migration_progress_callback)
  File "/usr/local/lib/python3.8/site-packages/django/db/migrations/executor.py", line 18, in __init__
    self.loader = MigrationLoader(self.connection)
  File "/usr/local/lib/python3.8/site-packages/django/db/migrations/loader.py", line 53, in __init__
    self.build_graph()
  File "/usr/local/lib/python3.8/site-packages/django/db/migrations/loader.py", line 216, in build_graph
    self.applied_migrations = recorder.applied_migrations()
  File "/usr/local/lib/python3.8/site-packages/django/db/migrations/recorder.py", line 77, in applied_migrations
    if self.has_table():
  File "/usr/local/lib/python3.8/site-packages/django/db/migrations/recorder.py", line 55, in has_table
    with self.connection.cursor() as cursor:
  File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 259, in cursor
    return self._cursor()
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 235, in _cursor
    self.ensure_connection()
  File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
    self.connect()
  File "/usr/local/lib/python3.8/site-packages/django/db/utils.py", line 90, in __exit__
    raise dj_exc_value.with_traceback(traceback) from exc_value
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 219, in ensure_connection
    self.connect()
  File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/base/base.py", line 200, in connect
    self.connection = self.get_new_connection(conn_params)
  File "/usr/local/lib/python3.8/site-packages/django/utils/asyncio.py", line 26, in inner
    return func(*args, **kwargs)
  File "/usr/local/lib/python3.8/site-packages/django/db/backends/postgresql/base.py", line 187, in get_new_connection
    connection = Database.connect(**conn_params)
  File "/usr/local/lib/python3.8/site-packages/psycopg2/__init__.py", line 127, in connect
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
django.db.utils.OperationalError: could not connect to server: No route to host
        Is the server running on host "db" (172.21.0.4) and accepting
        TCP/IP connections on port 5432?

m3@localhost:~/repos/saleor-platform> 

Tried

Might be due to operating system settings. I added PostgreSQL port 5432 to public ports by firewall, but error is still received.

Tried

Didn’t work:

  • Restarting Docker service
  • Rebooting the machine

Tried

Following commands didn’t help:

https://stackoverflow.com/a/57502873/3405291

Get Subnet (172.19.0.0/16) by:

docker network ls
docker inspect ${NETWORK_NAME}

Then:

sudo firewall-cmd --permanent --zone=public --add-rich-rule='rule family=ipv4 source address=172.19.0.0/16 accept'
sudo firewall-cmd --reload
sudo systemctl restart docker.service

Tried

This approach didn’t work, i.e. adding this to database service inside docker-compose.yml file:

     environment:
       - POSTGRES_HOST_AUTH_METHOD=trust

https://unix.stackexchange.com/a/589519/158683

networking – Exposing application accessible on localhost:3000 from EC2 instance to port 80

I have an EC2 instance on staging01.something.com and I ran docker-compose up on a project and it ended up being hosted on localhost:3000 inside my EC2 instance. How do I route localhost:3000 to staging01.something.com:80 so I can access it using that url from the outside? I already have the DNS set up and the inbound security rules set up.

Not sure if there’s a way to do this. I thought that application hosted on localhost inside a EC2 instance were accessible from the hostname of the server on the same port, but it’s not, and I am trying to figure out how I can deploy the application.

how to port forward in android hotspot to use metasploit

I am learning ethical hacking and I want to learn how to access a phone outside my network
I came to know I should port forward but I don’t have a router is there any cheep options

iptables – Limit port connections per public IP. Ubuntu 16

I have a server of a videogame hosting in a google cloud VM using ubuntu 16.
Some people are using bots to stop the server by reaching the connection limit

The error shown

So i was thinking of limiting how many connections a public IP can start, hopefully that will fix the problem. I tried using

iptables -A INPUT -p udp -m connlimit --connlimit-above 5 --connlimit-mask 32 -j REJECT

but i dont know if its working, but its blocking connections to domains like api.steampowered.com

Steam authentication for (player) failed: Could not resolve host: api.steampowered.com - CURL error code 6 (Couldn't resolve host name)

And that works if i remove that IP table.

So my question is, how can i block the connection limit (per public ip) to a specified port (30145) TCP & UDP to lets say 10?

I want to make static IP on my tablet using usb-c to ethernet port

I have Huawei Meta Pad t10s tablet & usb-c to pd rj45 adapter to connect it to ethernet not WIFI and it connect to internet automatically but I want to connect to server with another Gateway and need to enter static IP but can’t find the way in the software of the tablet.
can any one help me to find solution to this situation?

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