network – MacOS port become blocked

I was searching for this specific question for a long time now, nothing helped.
I have tried setting up Packet Filter as well.

I am running the latest macOS version on my development Mac. I am hosting some services via supervisord. It has a user interface on port 9001 running to be able to reset/start/stop services.

For all time long it worked well and I was able to access that UI on the local network.
But recently I ran a nmap from my Windows PC targeting my development Mac. After this, on nmap my opened ports were displayed as tcpwraped, (i am not running any firewall on my dev mac). I am not able to access my dev machine from the windows pc anymore. It says Unable to connect, though those ports are visible from the nmap.

All ports are accessible from my other MacBook, but on my PC all ports are NOT accessible.
Is there any way to fix this? I am running crazy trying to solve this for a week now.

ssh – MacOS(Catalina): permanent port forwarding

How can I do a permanent port forwarding on my Mac Catalina:

  • it will run on background
  • it will work after reboot
  • FW is off

Today I use command:

ssh -L 5900:localhost:5901 localhost

But it runs on foreground and closes after computer restart. So, I need something like this command BUT with 3 requirements that I wrote above. Is it possible?

Port Forwarding to Squid Port iptables

I have binded a few IPs to my server and I am having trouble forwarding them to the port that Squid is listening on. I am trying to open a random port and assign it to the IP and then forward it to port 3128.

I have used:

-t nat -A PREROUTING -p tcp -d 1.2.3.4 -m multiport --dports 5000:60000 -j DNAT --to-destination 1.2.3.4:3128 

-A FORWARD -p tcp -d 1.2.3.4 --dport 3128 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT

Any help would be appreciated.

Postfix: Port 587 activated by uncommenting a line in master.cf. I see no reference to this at postfix.org. Where is this officially documented?

When using Postfix Port 587 is turned on by uncommenting a line in master.cf.

submission inet  n       -       n       -       -       smtpd

I found this out by reading posts and comments on various websites. However I see no reference to this on the official Postfix Configuration Parameters page. That is very frustrating.

Where in the official docs does it say to uncomment the submission parameter in master.cf? I feel like I’m missing out on a lot of important information.

Localhost port delay using tc filters

After searching on Internet and reading this and this, I am able to have delay over three different ports as I am just only using the three main branches of the tree.

tc qdisc del dev lo root
tc qdisc add dev lo root handle 1:prio
tc qdisc add dev lo parent 1:1 handle 30: netem delay 146ms
tc qdisc add dev lo parent 1:2 handle 20: netem delay 275ms
tc qdisc add dev lo parent 1:3 handle 10: netem delay 258ms
tc filter add dev lo parent 1: protocol ip prio 1 u32 match ip dport 6332 0xffff flowid 1:1
tc filter add dev lo parent 1: protocol ip prio 1 u32 match ip dport 6333 0xffff flowid 1:2
tc filter add dev lo parent 1: protocol ip prio 1 u32 match ip dport 6334 0xffff flowid 1:3

The problem is that I am not able to scale it to four and over. I will desire to have up to 16 different ports.

scan – Spike in activity with port 3379 (SOCORFS)

My personal IPs on AWS are being scanned for 3379. Apparently, this is SOCORFS, registered to one Hugo Charbonneau. This port is getting scanned a lot more often in recent months:
https://isc.sans.edu/port.html?port=3379

Does anyone know what this is? It’s possible someone found a vulnerability in this protocol and we’re not yet publicly aware of it.

UPDATE:
I reached out to Hugo, will update if I have information from him.

UPDATE 2: Hugo used to work at Socomar International (over 20 years ago), which was a company who built technology for ship tracking. SOCORFS may be “Soco RFS”. Socomar was dissolved in 2006 though. All content I could find online was that it’s unlikely that this company’s products are widely used today. So, there’s a good chance port 3379 is actually being used for something else, nothing related to SOCORFS.

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linux – Unable to access the page after changing port 80 to 8123

I am launching a web page (WordPress) on the Ubuntu server, I needed to change the default port from 80 to 8123.

So, following the instructions I change ports.conf

2

And changed the 000-default.conf and mydomain.com.conf

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I also changed the incoming rules because the server is running in an AWS (Amazon) instance

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When I display the ports using nestat, it shows me that the port is used by apache2

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But the web page always gives me: This site is inaccessible Message. Another idea to check?
No iptables installed and of course I restarted the apache service.

windows 10 – Unable to forward port 6000

I am trying to run the following command in Windows 10:

adb forward tcp:6000 localfilesystem:/data/local/debugger-socket

I am getting an error and it’s not working:

adb.exe: error: cannot bind listener: cannot bind to 127.0.0.1:6000: An attempt was made to access a socket in a way forbidden by its access permissions. (10013)

I am running the cmd window as admin. How can I allow this?

I don’t have an anti-virus, and windows firewall is disabled.

firewall – Port Forwarding Not Working Although Port Is Open

I’m attempting to run a web server from home, in fact I have been trying for several years but always thought my router had something wrong with it.

Anyway, got new router and I have attempted again – but no luck.

What I have done – but not correctly (obviously)

1) Configured static ip on router
2) Configured port forwarding on router
3) Configured windows firewall – inbound rule

What I can do

1) I am running Xammp and can see homepage on 127.0.0.1
2) see open port 80 (or any other port if I open it) via – https://portchecker.co/
3)I can also see homepage from my static ip (PC)

But can’t access homepage from my ip

Hope I have gave enough detail to get someone to help

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