0
votes
2answers
26 views

How to check if my network blocks a port on Windows?

I'm trying to connect to a remote SSH server from my Windows machine, however the client (PuTTY) keeps raising an error telling that the remote server refuses the connection. I have already checked ...
0
votes
1answer
24 views

Is there a device with multi auxiliary (AUX) ports to configure multiple devices

Level: Beginner Sorry for the confusing title. I shall try to explain my best to explain my question. Question: Is there a networking device named X that has multiple AUX ports so that I can connect ...
0
votes
1answer
247 views

Cant open port on Windows 2012R2

I really never had problem with Windows Firewall, however today on new installation i`m trying to open port 110 but i cant. My firewall rule is: printscreen telnet myip 110 Connecting To ...
2
votes
2answers
96 views

Explain how to bind a service to a ip and port [closed]

Yesterday I had a discussion about running the same service, for example SMTP, on the same port on a server. I think this is possible by assigning multiple ip addresses to the server and bind the ...
2
votes
2answers
574 views

VMware ESX: Unable to delete PortGroup. 1 active ports

At work we have an ESX 4.1 cluster with some vlan's (Port Groups) configured on a vswitch on each host. A lot of these port groups aren't in use anymore so we decided to clean them up. We don't have ...
0
votes
1answer
73 views

Iptables log clent IP to file

Im trying to track whether some ports are being used, and what by, as I want to close them. I have made some iptables traffic counters, and have worked out is a small amount of traffic, coming into a ...
1
vote
3answers
1k views

How to check a route exist between two hosts for a particular port?

How to check whether there is a route between two hosts for a particular port (e.g. 1433).
9
votes
3answers
255 views

advantages in closing a port where no services are running

Are there advantages in closing a port where no services are running? What do I gain in terminating a connection at iptables level instead of what does it next (I guess OS).
-1
votes
2answers
2k views

How does server handle multiple clients on the same port? Multiple sockets or multiple ports? [closed]

I have a misundertanding about some networking theory and because I couldn't find a definitive answer online (most resourceas are theory and theory etc without concise examples) I'm asking here. ...
0
votes
2answers
882 views

Debugging a connection refused response on port 21

My colleagues and I are having trouble accessing Heart Internet's FTP servers. We are running a mixture of Macs and PCs and we have a Linux box in the office too. None of our machines can connect. ...
4
votes
1answer
677 views

Linux networking port exhaustion

I've done as much research as I could on this without digging right off in the kernel source. There seems to be a large amount of disinformation/incorrect info on the subject, so I hope this answers ...
1
vote
1answer
53 views

How to diagnose why a port is broadcasting a “ZeroWindow” status

I have two CentOS servers (one is an app server, the other is a DB) communicating over a port. Every once in a while, the application server starts broadcasting that the port connected to the DB has a ...
2
votes
2answers
817 views

Can I run two server applications on port 80?

I am currently running nginx on port 80, with the configured server names as example.com and www.example.com. I also have a Flask application that I would like to have accessible through port 80, but ...
0
votes
2answers
242 views

Re-routing incoming network traffic from sub-domain to specific port on Windows 2008

I'll do my best to explain this. I've got a Windows 2008 server with TWO local intranet-sites running on it. The first website will open if you just type in the name of the IP address - ...
0
votes
1answer
144 views

Firewall connected to a switch using 2 ports (LAN & DMZ), but switch management talks on DMZ port

Someone let me know if I'm off track here. I'm setting up a firewall with 3 ports configured (WAN, LAN, and DMZ). The LAN and DMZ ports both connect to the same switch, on which I will configure a ...
1
vote
0answers
35 views

Java BindExceptions in delayed stop/start conditions

I have a script that will automatically stop a server and restart it on the same port/ip address. I've noticed that some mornings the server doesn't restart successfully because it gets Java ...
0
votes
1answer
183 views

tell tcpdump to not include the port numbers in the output

how can tell tcpdump to not include the port numbers in the output? Right now it includes the resolved IP + resolved port. I just need the resolved IP address (hostnames)
-4
votes
1answer
46 views

Bandwidth on multiport Network Card [closed]

When a 1Gb Network Card has two ports, the bandwith on each Port is : Case 1 : Port 1 = 1 Gb Port 2 = 1 Gb Case 2 : Port 1 = 1/2 Gb Port 2 = 1/2 Gb Case 3 : Port 1 = < 1 Gb & > 1/2 Gb Port ...
1
vote
1answer
147 views

Port forwarding on Ubuntu - what are the minimum and maximum port numbers to use?

I'm using rinetd on Ubuntu as a port forwarding server. I'm running this on EC2. I need to know which ports are available for me to use for port forwarding. I know that the privileged ports are 0 - ...
0
votes
1answer
129 views

Is there software that will convert bidirectional TCP traffic from one port to another? [closed]

I have an application that needs to send and receive traffic on a certain TCP port, say 5000. The server component uses port 6000. Is there any software that will allow me to "TCP bridge" these ...
0
votes
1answer
125 views

Remapping ports based on incoming domain name?

I've been running a small game server for a while and want to set up a second one on the same server. The issue is that these servers don't support domain names; if a request comes in on the right ...
0
votes
3answers
166 views

can we use the well known port for own purpose?

I have written a shell script to scan the ports of system using nmap. I am searching for some port number like 515 which is used by the Line Printer Daemon—print service and if it is there means I ...
0
votes
0answers
890 views

SMTP port 25 - connection refused

Here is the error I have running a python program that sends a mail: Traceback (most recent call last): File "D:/Share/Backup/DEV/2_tools/bbb_reports.py", line 116, in <module> ...
0
votes
1answer
187 views

How to check whether request is coming to my Server or not?

I have one Software for port checking on remote server. we also use Telnet command for port checking for eg: for rdp port, we use C:> telnet 10.1.0.10 3389. but the same thing i am doing from ...
-3
votes
1answer
507 views

'Gigabit' Ethernet Port Tester? [closed]

A quick google search shows there seems to only exist handheld testers for 10/100 Ethernet ports. Any ideas why that is and where we could find one that works with a Gigabit LAN? Perhaps the 10/100 ...
1
vote
3answers
245 views

Accessing LAN IP address from outside

I have an SCM server connected to my office LAN which runs the SCM tools like git, svn, etc. The office router has been configured with 'Port Forwarding' so that the SCM server can be accessed through ...
0
votes
1answer
638 views

What ports need open from netbackup server to client?

I need to know what ports should be open from netbackup server to the server, where netbackup client is installed and vise versa? So I need to know what network access should exist to backup and ...
2
votes
3answers
679 views

Port 80 and 443 won't forward?

I live in Australia, and my ISP is Bigpond (ADSL2) with a "Thomson TG782T" Router, and my port 80 and 443 won't forward. I have set up an Apache server before years ago (I was in a different ...
1
vote
1answer
91 views

How to filter some protocols on all ports

Under CentOS, how can I filter traffic by protocol rather than by port? For example, I would like to filter ftp traffic regardless of the port being used in order to prevent users on the network from ...
4
votes
3answers
953 views

Phantom NIC issue causing eth0/1 to drop out

We are experiencing a very strange and frustrating problem. Our company has servers here in Massachusetts, as well as in California. The issues we are seeing are only on the CA hardware. Out in CA, we ...
0
votes
2answers
275 views

Protecting direct access to port 11211 via a browser (memcached)

When I recently discovered about accessing ports via your browser at a domain level. Example, I accessed my domain at port 11211, I got an output of this: ERROR ERROR ERROR ERROR ERROR ERROR ERROR ...
1
vote
0answers
414 views

VisualSVN Port Forwarding is Not Resolving

I am using the FreeDNS Update client to dynamically update the IP address of a subdomain. I can access https://localhost:8282/svn/ on the laptop but I cannot access it from ...
1
vote
1answer
340 views

vlan 1 and 1002-1005 in a trunk connection-should they be allowed?

If I have a trunk connection that should allow only two VLANs(100 and 200 for example), is it neccessary to also allow the default vlan 1 or VLANs 1002-1005. I am trying to configure a switch port for ...
-4
votes
1answer
423 views

Which port of my computer is my ISP connected to? [closed]

I'm trying to find out the port number of my computer to which my ISP actually connects & provides the internet service, given my ADSL modem is operating in Bridge Mode instead of PPPoE. I ...
0
votes
2answers
689 views

Which UDP ports are required to resolve external hosts?

Today I asked my hoster to block all UDP ports except port 53. Due to daily UDP attacks, this was currently the only option to stop flooding my lines. Now since the block is in place, I cannot wget ...
13
votes
5answers
5k views

Understanding Ports: How do multiple browser tabs communicate at the same time? [closed]

I realized today that I fundamentally don't understand how port communication works. If I fire up an instance of a webserver listening on port 80, it can respond to many requests from many different ...
0
votes
2answers
164 views

Using IIS 7 for accessing site more easily on network

I have a site hosted in IIS which I am able to access on the local machine using the IP address and port number eg http://114.12.34.23:86/ . What I would like instead is to access this using ...
0
votes
1answer
387 views

Cisco ASA Port Number Reuse

So our client is using a Cisco ASA and they are having occasional "Page cannot be displayed" errors. We have determined through lots of troubleshooting that our firewall doesn't like the ASA reusing ...
0
votes
1answer
43 views

Problem during SSH

I am trying to run ssh command from one machine to another and gets the following error message ssh: connect to host 10.22.254.70 port 22: Connection refused It is able to ping the same machine ...
-2
votes
1answer
34 views

Assign hardware to different users on windows server 2003

I have this software that has port conflicts on my windows 2003 server. So my solution is to use Virtual network card from http://www.ntkernel.com/w&p.php?id=32 . I have 10 users per server, how ...
0
votes
2answers
521 views

Force program to use only specific local port

For example: Firefox uses random local port numbers to connect to websites. (Dozens of different local ports can be used at any given time.) Is it possible to force a program to only use specific ...
0
votes
1answer
144 views

How to check which port to enable on Windows Server 2008 Firewall

I have an application which supposed to be launch from a client machine, but every time I launch it, it shows me an error saying "Failed to talk to database". By the way it is a .Net application and ...
5
votes
1answer
239 views

Ports below 1024

DISCLAIMER: I know how to run daemons that either listen on ports <1024 by using privbind or some iptables REDIRECT. Or more generally spoken, how to make daemons available on priviliged ports that ...
1
vote
2answers
145 views

Can't access server use domain name, got tcp flag RST

I have a http sever provide service to internet, so I configured port forward in router. It’s fine for users access server outside company (URL: _http://mydomain.com:80/). But if the user is inside ...
1
vote
1answer
46 views

Connecting to a service from outside the network

I seek to run a server on the 8000 port on my machine. My computer is part of a wireless home network which is connected to the Internet by a Linksys router. In this scenario, how would a host outside ...
2
votes
2answers
18k views

How can I check if a particular port is open from one site to another?

I want to know if port 139 TCP is open from a server on one domain to another. How would I do this? I know that I can use Telnet to test port 25 to a server with Exchange installed - but that only ...
0
votes
2answers
467 views

Two applications listening on the same port

Wat happens if two applications try to listen to the same port?
0
votes
1answer
233 views

What is nicetec-mgmt on port 2557?

I've been looking at wireshark, and have a lot of UDP traffic to port 2557 (from 25322), the port is reportedly used for nicetec-mgmt, does anyone know what this is?
2
votes
2answers
2k views

How to test firewall connectivity?

Somehow I have been charged with the task of organizing the installation of a new production environment involving 4 servers. I have to make requests to the Network administrator to open up ports on ...
0
votes
1answer
210 views

Is there a common rule to specify client port number resolution?

Hey, i want to know much about port numbers used by source (clients) and destination (servers). Can clients get any port number or is there are common way to give them port numbers? As an example if ...