Tagged Questions

Port is a generic term that can refer to port number (software related term), and computer hardware port. Here, questions referencing this tag refer to port numbers.

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0
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2answers
40 views

IPTables only solution to block any IP address who has made too many connections or reconnections

I’m looking for an IPTables only solution to block any IP address who has made too many (e.g. more than 5) connections or reconnections within a short period of time (e.g. 1 minutes) on a certain ...
3
votes
1answer
255 views

Does closed Port 25 cause mail to be marked as spam?

I have a web server where I have installed Postfix for sending emails only. All incoming mails will be handled by google apps and not my web server. Using iptables rules, I have blocked all incoming ...
0
votes
1answer
36 views

Do blocking input ports increases security?

1-Do blocking unused input ports in firewall increases system security? How? (as there is no daemon listening on those ports anyway) 2-Do dropping those unused ports will positively or negatively ...
-5
votes
0answers
26 views

TCP ports unreachable [closed]

Several network adapter devices (Global Caché GC100) receive their IP address from a DHCP server. A TCP port is opened on such device to control it. After some days (from one week to 4 months), those ...
1
vote
3answers
54 views

Test port reachability from a remote host even though the port is not bound to a service?

I need to check whether a remote host is able to reach a specific port. At the time of test the service bound to that port will be down. The possible issues that the test would address would be : ...
0
votes
2answers
43 views

Cisco 887VA - Cannot open port 110

I am trying to configure a Cisco 887VA at work to open port 110, but no matter what I try, it doesn't seem to work. The router is accessed from within the building via a web UI but require CLI ...
0
votes
1answer
28 views

tomcat-webapp not accessible via port after windows-update

we are running 4 Virtual Machines on a MS HyperV Host. On one of the VMs (192.168.50.15) we have multiple Tomcat-Webapps on separate ports - 9010: Jenkins - 9020: Atlassian Jira - 9030: Wiki .. ...
0
votes
0answers
27 views

Does NAT forwards ping requests and port scans to all subnet computers? [migrated]

If I ping some friend's public IP address, this is usually the address of his router. Does the router forward the ping request to all devices on it's network? If the devices are all turned off will ...
0
votes
2answers
44 views

azure endpoint for cassandra does not work for ports 7000, 7001, 7199

I have setup apache cassandra on a centos7 compatible linux machine in azure. I can telnet directly to port 7000, etc on the IP address on the machine, however I cannot telnet to that same port from ...
1
vote
1answer
54 views

Node.js websocket error “Error: listen EADDRNOTAVAIL Error: listen EADDRNOTAVAIL”

Application work fine on localhost .but when its connect to server it getting error. I connect server through port 22 But my app connecting server port 80. This is the error Error: listen ...
1
vote
1answer
34 views

How to set IBM Websphere 8 to serve web applications on different ports?

I need to deploy two applications as WAR files on Websphere. Both of them will require only HTTPS access. Is it possible to run these two web applications on separate ports on same Websphere ...
0
votes
0answers
19 views

Websphere Virtual Host

IBM WAS 8 gives option to create virtual hosts. At the time of WAR deployment, I am able to map the application to a particular virtual host. For each virtual host, I am able to assign a port number ...
0
votes
2answers
56 views

Can't make confluence run on port 80 with Windows Server 2012 R2

I am trying to get Confluence to run on port 80 using Windows Server 2012 R2. It's not working even after reinstalling it on port 8090. But the default works great locally. netstat -abn yields nothing ...
0
votes
0answers
22 views

Network access sometimes lost, disabling port security temporary solves?

I have network based primarily on Edge-Core managed switched. Port security with max mac count = 1 is enabled, DHCP snoopping enabled. Some clients have troubles with accesing network, but when I ...
0
votes
0answers
27 views

RPC Ports getting reset to 5000-5002 on reboot

I've run into a very common issue with RPC Endpoint Mapper ports not being available. The default RPC ports are 5000-5002. When I edit the registry and set the ports to a wider range (say, xx100 - ...
0
votes
1answer
42 views

How to make Nginx try_files ignore the port the server listens?

I have a server running both OpenVPN and Nginx on port 443: I configured OpenVPN to run on 443 with the port-share option while Nginx runs on 4545. All of this seems to work except the try_files ...
1
vote
1answer
14 views

802.1X port-based wired NAP Enforcement

I'm learning about NAP enforcement in Windows Server 2008 R2. I am unable to grasp how to enforce NAP based on port. I understand that 802.1x wired NAP Enforcement uses switches to decide whether ...
-3
votes
1answer
26 views

Service port accessible only by one network card

I have server 08 R2 with two network cards. One is for the internal network (10.1.1.x) and another for internet (192.168.1.X connected to the modem). Network clients always accessed a service in this ...
0
votes
0answers
36 views

Dell 5548P, MIB value for port security violation notification

Anyone have idea on MIB values(OID value) for Port security violation notification with dell 5548P switches.On Cisco its [1.3.6.1.4.1.9.9.315.0], not sure whether i can use the same for montioring ...
-1
votes
1answer
24 views

Application protocol-based port forwarding/redirection [closed]

I need to split traffic on port 80 between HTTP and non-HTTP, and internally forward HTTP traffic to a port nginx will listen to, and non-HTTP traffic to port 22. Does anyone know of a piece of ...
-1
votes
2answers
110 views

“Connection to host lost” on telnet to port 25 [closed]

i installed smtp4dev to test receive mails in my localserver(xampp) for the registration form here: https://github.com/panique/php-login note: localserver is on port: 8080 my php.ini file for SMTP ...
0
votes
2answers
35 views

Remote port forwarding through EC2 not working, though address is in use

I have a remote machine running a server which I'd like access to locally. However, I can only SSH into the machine, not use any other ports. I booted up an Amazon EC2 instances and opened all its ...
1
vote
1answer
29 views

It it safe to forward an ephemeral port to an internal host in a NAT environment?

Short story, I want to expose SSH from a box in a NATed environment to the internet but would prefer to do it on a high (in the ephemeral range) port. Is it safe to port forward an ephemeral port to ...
0
votes
1answer
71 views

Redirect ssh trafic for one user through another port

Is it possible to have a configuration like this: A server which listen ssh connections on port 22 as usual For one user (let's say git) redirect all the traffic through another port (2222 for ...
0
votes
1answer
37 views

Is netbios required with samba -> win7 and what ports are needed for view/read/write functionality?

Basically I do an IT course at my college (United Kingdom) and obviously with it being a college, they have web filters and a restrictive firewall. To bypass the web blocks and to access my rented ...
0
votes
0answers
32 views

Filtered port 22 with no firewall settings

I'm trying to connect to an sftp server from a CentOS 5.5 server. The connection is never established. When I run the command: nmap -p 22 -P0 <sftp server address> PORT STATE SERVICE ...
1
vote
1answer
43 views

Can't access ports assigned to Rails 4.2, but 4.04 works fine

I have Ruby 2.1.2 installed and Rails 4.2. Bundle install runs without error. I can do a Rails C without error. Rails s -p3004 launches with webrick or thin without error When I browse to ...
0
votes
0answers
47 views

Server 2012 R2 Telnet

Let me first get the infrastructure out of the way. We have one 2012 R2 Server acting as the Hyper V host for 2 servers. The two virtual machines is one 2012 R2 Server and one 2003 SBS server that we ...
0
votes
0answers
350 views

Windows TCP Port 139 Netbios-ssn vulnerability

I ran netstat -b on my computer. Two results showed that I do not understand, VAIO being another PC on the LAN. [firefox.exe] TCP 192.168.100.106:49186 VAIO:netbios-ssn TIME_WAIT TCP ...
-2
votes
2answers
83 views

Linux: How to find out which ports did my application use [without being root]? [closed]

I have the following question. On a CentOS machine I run an application which connects to another system. I am interested in finding out on which ports (input/output) the communication happened. The ...
0
votes
4answers
59 views

Best Method to test Opened Ports [closed]

We have a requirment where in we have to test 500+ Port opening rules. So requires a suggest on below points. Which is the best tool to test the connectivity of the ports. Telnet will be sufficient ...
0
votes
0answers
68 views

Monitor traffic on ports with Cacti

This seems like a basic question, but i haven't found any solution yet. Recently I've installed Cacti for interface traffic monitoring. That works fine, but I would like to see these graphs for used ...
0
votes
1answer
35 views

cannot send emails to other Web servers

I'm trying to limit my server's open ports in CSF. The IPv4 port settings include: # Allow incoming TCP ports TCP_IN = "22,25,53,80,110,143,443,587,3654,53343” # Allow outgoing TCP ports TCP_OUT = ...
0
votes
1answer
32 views

Amazon Security Groups: Change Inbound SSH Port

How can I change the Inbound SSH Port on my Amazon Security Group? When adding a new rule for SSH, the Port defaults to 22 and cannot be edited. Is this possible? Please note: This question is ...
0
votes
1answer
56 views

Run sshd on multiple ports but different domains [duplicate]

I want to run my sshd server on multiple ports but different domains. The server should be reachable as following: ssh -p 12345 example.com ssh -p 22 git.example.com I tried to modify ...
1
vote
2answers
102 views

Haproxy backend servers on different interfaces

I have a haproxy server which gets limited to some 60k connections. I think it is because of ephemeral port limit as I have 1:1 connection mapping, so all my outgoing connections go to the same ...
0
votes
1answer
31 views

Is port 21 active?

I have recently installed sftp (secure shell ftp) into proftpd. Knowing that the default port for sftp is 22, I have also changed the port value from 23 to 22 in /etc/proftpd.sftp.conf. So I expect it ...
-2
votes
1answer
74 views

Hiding services from port scan

Upon running a port scan on my server: 22/tcp open ssh (protocol 2.0) 80/tcp open http nginx 1.4.6 (Ubuntu) 443/tcp open http nginx 1.4.6 (Ubuntu) 3000/tcp open ppp? 3001/tcp open ...
3
votes
4answers
568 views

Varnish on 80, nginx on 8080, on which port to put jenkins?

On my staging server, I have Varnish + Nginx. They are on port 80 and 8080. Given that I have to install jenkins, on which port I have to bind it ? (which is usually 8080 but it's already taken)
0
votes
1answer
94 views

How do I block all access to machine except port 3389 using Open vSwitch

I can allow access to the machine and block everything else using: ovs-ofctl add-flow xenbr0 "dl_src={mac-address} priority=39000 dl_type=0x0800 nw_dst={ip-address} idle_timeout=65000 action=normal" ...
1
vote
2answers
71 views

How to get the port number a user ssh'd in on?

I am transitioning servers away from port 22 in an existing multiuser environment. I have configured sshd to listen on two ports: 22 and the new port. Now I would like to detect when a user connects ...
-3
votes
3answers
70 views

SSH on linux | CentOS [closed]

I have a Linux server using CentOS. I have changed the SSH config to make it a little more secure, First I changed the from from default 21 (or 22?) to 34786. This way if someone tries to hack in at ...
-1
votes
1answer
41 views

What is the difference between an accelerated LAN port and a regular non-accelerated port? [closed]

Can someone explain the difference for me? Wondering more about the difference for the end user, but a technical description would also be helpful.
-1
votes
1answer
180 views

Can't access apache by port 80 from external

I followed a lot of solutions I found, but it still doesn't work. I can access the server by port 80 inside my network, bui I can't on another one, just by another port (like 62, as I set). Files: ...
0
votes
2answers
23 views

How to append mysql access to iptables

On one of my servers, I can see this: ACCEPT tcp -- distinct_server_ip anywhere tcp dpt:mysql By doing sudo iptables -L | grep distinct_server_ip And with ...
-1
votes
2answers
55 views

Get domains accessed through a specific port [closed]

I'm developing a product and at a certain point I need to get domain names used to access some service on a specific port. Let's suppose I've a computers network with Internet access through a Linux ...
0
votes
0answers
24 views

Can Azure load balancing, balance to several ports on one (or more) VMs

I have a single threaded application (on an Azure VM), which I want to run one instance per cpu core. I will need to use one port per instance. (e.g., ports: 81,82,83, and 84) Is it possible to load ...
1
vote
1answer
639 views

tomcat cannot change port 8080 to 80

I want to change the port 8080 to the default HTTP port (80), to use a Jersey Application as HTTP-Restful API. Therefore I replaced the port from 8080 to 80 (within /etc/tomcat7/server.xml) and ...
0
votes
1answer
210 views

Daloradius / Freeradius mac authentication

I setup a centos freeradius mysql with the frontend daloradius using the steps on this site http://linuxdrops.com/install-freeradius-with-web-based-management-daloradius-on-centosrhel-debian-ubuntu/ ...
0
votes
1answer
95 views

How to ensure Netgear GS724TP is not blocking Dropbox Lan Sync - port 17500

We're a small company using Drop Box for business but have noticed that Lan Sync refuses to work on our network (it works fine at home). After trouble shooting the issues on the Dropbox forums, it's ...