-7
votes
0answers
27 views

SSH Blocked (even on port 80) [on hold]

I'm trying to SSH into my Raspberry Pi at home, and my school blocks SSH. I tried both port 80 and 443. Also, OpenVPN and PPTP is blocked, so I don't know how to bypass it.
0
votes
1answer
40 views

How to set up routing tables in EC2, so that ping works

I have a wide open security group which I rely on for instances to be able to connect. I also have a private network of 172.*. addresses, as shown here: What do I need to do in order to allow ...
0
votes
2answers
105 views

Forward SSH request to an External Server to an Internal Server

I have a VM config currently where I have 1 external IP pointing to a VM with an Nginx HTTP Reverse proxy serving HTTP Web Pages from several internal VMs without external IPs. I need a similar setup ...
-1
votes
1answer
71 views

SSH through another machine at work to an external server [duplicate]

I'm fairly sure this will have been asked before, I have found similar questions but I do not fully understand how to apply them to my situation. So, sorry for asking again. We have a number of ...
2
votes
0answers
140 views

Ssh issues on Google Compute Engine

I've just updated a few servers to the newer version of the gce stack, and I've started having some ssh issues that I'm not quite sure how to fix. I've already looked into issues with the firewall, ...
0
votes
2answers
172 views

Stunnel multiple ports through the same Port

I'm looking for some help regarding an stunnel configuration I'm working on. Basically I want to have a DMZ machine accept inbound connections to port 80 and 110, and then forward them through my ...
-3
votes
1answer
51 views

iptables allow A -> B:22 , B -> everywhere:22

I want iptables rules that let a server allow incoming ssh from a specific host and at the same time this server can connect ssh on any destination, then block any other in/out traffic Thanks in ...
-3
votes
1answer
61 views

Can I use SSH tunnel to get around firewall? [closed]

I want to ssh to Server-A which only accepts connections on port 1234. This port is blocked on my current network's firewall. Server-B however, accepts ssh connections on standard port 22, and is ...
0
votes
1answer
57 views

Blocking Port 22 From Unknown IPs Security Measure

A server I'm working on has blocked all unknown addresses from accessing port 22 (via a firewall). An IP address has to be added to the firewall first via a control panel (or command line) before it ...
0
votes
3answers
328 views

Can you block an ip with multiple connections? (Apache ddos attack)

My server is under a Apache ddos attack right now. There's a ton of single ip addresses with 30+ connections. When I use this SSH command: netstat -n | grep ':80' | awk -F' ' '{print $5}' | awk ...
0
votes
1answer
75 views

How to recover from bad firewall config in Azure

All our virtual machines recently disappeared from Azure because our trial quotas were reached. I decided to follow this guide for recovering the VMS: ...
0
votes
1answer
189 views

SSH to Mac OS X 10.7

I am trying to SSH from my work computer (Ubuntu) to my home computer (OSX 10.7) that is behind a Belkin router and have so far been entirely unsuccessful. Here are the steps I have taken so far ...
-4
votes
3answers
1k views

Not using SSH Pubkey Authentication is really serious security flaw compare to regular Password Authentication

How would using PubkeyAuthentication would be more secure than using PasswordAuthentication, considering the following facts: Default SSH port is moved from its default Firewall blacklists an IP ...
1
vote
1answer
112 views

Directory Listing (ls) error ONLY in port 22 (SFTP)

Using SFTP I suddenly get this result: Status: Connecting to 64.207.146.82... Response: fzSftp started Command: open "root@64.207.146.82" 22 Command: Pass: ********* Status: Connected to ...
3
votes
3answers
545 views

How can I block access to public server IP for OpenSSH in Debian?

I got a Debian server with a public and a private IP in a DMZ. I need to be able to connect to it through SSH on our private side, and then block all access to the public address. Both /etc/hosts.deny ...
0
votes
1answer
758 views

SSH: Port Forwarding, Firewalls, & Plesk [closed]

I edited my SSH configuration to accept connections on Port 213, as it was one of the few ports that my work firewall allows through. I then restarted sshd and everything was going well. I tested ...
0
votes
2answers
566 views

Route ssh traffic based on hostname using FreeBSD/pf?

I have a proxy/firewall machine running FreeBSD 9, using PF to route and filter traffic as needed. Now I'm setting up a git server, which runs over ssh, but I'm already using port 22 for ssh. I would ...
2
votes
2answers
401 views

Is it safe to only allow SSH access from certain IPs?

I'm currently installing CSF (http://www.configserver.com/) for my Ubuntu server and in CSf you're able to specify the ports you want everyone to be able to access, and if your IP is in the allowed ...
1
vote
2answers
483 views

Firewall blocking some strange communications from source-port 22 to over-seas ip addresses. Should I be concerned?

I'm responsible for a server that serves a single service (ssh) over the internet via port-forwarding through a firewall. The ssh service login is limited to encryption-key only (no passwords ...
1
vote
3answers
534 views

Firewalls (ufw vs apf) on Ubuntu

On my LAMP servers, do either of the firewall interfaces (ufw or apt) allow you to setup rate limiting to automatically ban brute force attempts (e.g. via SSH)? Or, is it best to install fail2ban in ...
1
vote
2answers
196 views

how to make chained ssh work with git

I am trying to get round a silly firewall issue. I am trying to chain ssh access to git through a proxy ssh: ~/git-chain: #!/bin/bash ssh hosticangetto ssh $* # End And then: $ export ...
2
votes
1answer
404 views

Ban Specific IP's on VPS

I have a case where I want to ban specific IP address on my VPS. To ban the IP's I use SSH Access with this code: iptables -I INPUT -s my-ip-here -j DROP The case wich I want to ban is as ...
3
votes
3answers
1k views

How to block ssh from a certain area

This might sound like a bit of a strange question, but I've just taken a sample of over 80 IPs which have failed SSH authentication, and I've mapped them using an online mapping tool. All of them ...
1
vote
1answer
165 views

iptables --dport ssh

In iptables, what is the difference between --dport ssh and --dport 22? i.e. when I change the port in sshd's settings, will iptables automatically get the new port and use that wherever --dport ssh ...
4
votes
3answers
1k views

SSH from A through B to C, using private key on B

I'm looking for a simple way to SSH from my local machine, A, through a proxy, B, to a destination host, C. The private key that goes with the public key on C is on B, and I can't put that key on my ...
2
votes
1answer
149 views

Security risks of opening firewall for ssh access from internal to DMZ

I have a server in our internal network, and there are files/reports on that server that I need to get to a box in our DMZ. They aren't served up directly from the box in the DMZ; they are processed ...
0
votes
4answers
5k views

Checking sftp connectivity

I can connect to the remote server using following command... sftp abc@255.136.181.123 But this works from server A and if I use the same command on Server B it does not work. 1) What changes ...
1
vote
3answers
700 views

SSH connection keeps crashing

although this is not a real programming question perhaps anyone has any idea regarding my problem. It's pretty weird. When I remotely connect one of our ubuntu servers per ssh the connection can be ...
0
votes
2answers
2k views

ping fails but ssh succeeds

I'm facing a situation where one app(using ssh) can connect from Machine A (Linux) to Machine B (windows), whereas Machine A cannot ping Machine B. Another app on Machine A which connects to Machine B ...
-1
votes
1answer
75 views

how to ssh to the machine behind the firewall? [duplicate]

Possible Duplicates: SSH to a computer that will then SSH to another computer how to ssh to the machine behind the firewall? I have 3 Linux machines A, B and C. I can ssh from A to B; B ...
-1
votes
2answers
257 views

how to ssh to the machine behind the firewall? [duplicate]

Possible Duplicate: SSH to a computer that will then SSH to another computer I have 3 Linux machines A, B and C. I can ssh from A to B; B to C but not from A to C directly because C is ...
0
votes
1answer
206 views

Firestarter on debian server. Should I activate SSH?

I have just installed Firestarter on my Debian server, because I want an easy-to-use tool to administer the firewall on this server. The plan is to restrict access to some ports (e.g. 8080) and I've ...
7
votes
2answers
162 views

Still worthwhile to firewall/filter ssh access except from specific IPs?

A number of years ago now, there were several remote exploits for OpenSSH which prompted many admins including myself to start filtering port 22 at the network perimeter, permitting only IP addresses ...
0
votes
2answers
148 views

secure methods of automating file transfer via scp

Yesterday I asked a question about restricting access via ssh, and I was advised to have my machine access the data on the public workstation. As an unfortunate necessary follow-up to that, how can I ...
2
votes
2answers
315 views

Know of a trick to sustain quiet ssh connections from firewall auto-disconnects?

Our enterprise firewall is configured to disconnect ssh connections after 30 minutes of of inactivity. Sometimes, I need to perform an operation on a server that requires a sustained connection ...
0
votes
3answers
2k views

IPtables blocking SSH, even after its been implicitly enabled?

Im having trouble with the following iptables entries. I want to stop the server from communicating with the outside world except for ssh, but when I enter the fourth command (iptables -P OUTPUT DROP) ...
3
votes
2answers
5k views

Why can't I ssh or ping my brand new Amazon EC2 instance?

I just created a free EC2 instance with all the defaults. It says it's running in the AWS Management Console. On the "Instance Actions" menu, I click "Connect". I copy the DNS name provided (looks ...
0
votes
1answer
3k views

Firewall has begun dropping SSH response

My firewall (Sonicwall NSA 2400) has begun dropping the SSH response from my remote linux server. When I initiate an SSH session from my internal IP it times out, and when I look at the firewall log, ...
2
votes
1answer
716 views

Just installed Ubuntu 10.10, can't connect via SSH

I've just downloaded and installed Ubuntu 10.10 in a VM on virtualbox (4.0.4). Everything on the VM is set to the defaults: NAT adapter. When installing the OS, I selected OpenSSH, and nothing else. ...
7
votes
3answers
1k views

Running a webserver behind a firewall, is it secure?

Currently we have a Linux-based firewall which NAT-ing our public IP address to give internet access to our staff's PCs and a Windows Server 2003 for internal filesharing. I want to host Redmine/SVN ...
3
votes
2answers
214 views

ipTables: How to improve the current set-up?

It took a lot of time and digging to get my ipTables working fairly well. Current status: 'Works' w/ a noticeable, reproducible (almost unacceptable) delay on SSH connections. This delay goes away as ...
1
vote
4answers
1k views

ssh from home to machine behind firewall

Semi-newbie, so flame-throwers to 'singe only' please. ;-) I have machine A at work, which I'd like to SSH into from a machine at home (call it machine B) -- machine A is behind our corporate ...
3
votes
2answers
2k views

VNC connection via SSH proxy machine

I would like to make a VNC connection from home to a Windows machine at work. The Windows machine is not accessible from the outside, but there is a Linux box that does have port 22 open, so it would ...
1
vote
1answer
470 views

Can ping, can establish SSH connection in one way but not on other way

First of all, sorry about my english. We're facing a very strange problem with SSH connection between two specific servers. Let's say we have X1, X2 and Y servers. Where X1 and X2 are behind the ...
1
vote
4answers
759 views

SSH over HTTP(S)

I have an apache server at work.com that only allows incoming HTTP and HTTPS requests over the usual port 80 and 443. These are the only ports that are open on the network. I would like to be able ...
2
votes
2answers
279 views

Why does sshd ignore connection requests from certain IPs?

THE SETUP Two machines at home, behind a residential cable modem and router: gaia: Kubuntu 10.04, 192.168.0.103 pixel: Ubuntu 10.04, 192.168.0.104 router: DLink DI-52, 1.1.1.1 (not its real IP). ...
0
votes
2answers
344 views

Linux - Block ssh users from accessing other machines on the network

I have set up a virtual machine on my network for uni project development. I have 6 team members and I don't want them to SSH in and start sniffing my network traffic. I already have set the firewall ...
0
votes
1answer
268 views

Nodes inside Cisco VPN. Incoming SSH requests allowed. But can't initiate an outbound SSH

I've a gateway-to-gateway VPN setup between my Linksys RV042 router and a Cisco VPN. I am able to SSH into any of the machine inside the VPN from my network. But none of the machines inside the VPN ...
2
votes
4answers
464 views

What ports tend to be unfiltered by boneheaded firewalls?

I like to be able to ssh into my server (shocking, I know). The problem comes when I'm traveling, where I face a variety of firewalls in hotels and other institutions, having a variety of ...
0
votes
1answer
4k views

Linux Teamviewer functionality, but for ssh only

I need to access some Linux server behind NAT (no ports forwarded), so I need to have something like "phone home" like Teamviewer has. There is no GUI, but somebody can log in through SSH and dictate ...