2
votes
1answer
39 views

Non-invasive way for our network team to run ping/tracert/etc from various servers

In troubleshooting connectivity issues, our network team lacks the rights on our servers (Windows and RHEL) to connect and test connectivity (for example, when tweaking a firewall rule, a ticket ...
1
vote
1answer
29 views

ssh connection freeze after password phase

I'm trying to connect to a server (Oracle Linux 6.3) and after I insert the password the session just freeze. I checked the audit log and I've authenticated successfully, after I restarted the ...
2
votes
4answers
114 views

Can one server see traffic to another server inside a VLAN?

Scenario: I have a rack of servers that all belong to the same private VLAN. I transfer data from Server 1 to Server 2. Is it possible for any of the other servers to sniff out the data sent or is ...
0
votes
1answer
71 views

Can access server using both LAN & WAN IP from LAN, but no access outside of LAN

I have a server running ArchLinux at home called SERVER. Currently, I can gain access to this machine via SSH by issuing ssh user@SERVER from another computer that is connected on the same LAN. It ...
-1
votes
1answer
65 views

How to add Public IP to Cent OS [closed]

I am trying to configure a Public(Static) IP in Cent OS 6.4. For this, I made a copy of eth0(added local IP, so that I can connect the system to Internet) and named it to eth0:0(added Public IP, so ...
0
votes
2answers
167 views

SSH connection timed out

Every time I try to ssh into my computer from my chromebook $ssh -vvv user@***.**.***.*** I get the following output OpenSSH_5.2p1, OpenSSL 1.0.1e 11 Feb 2013 debug1: Reading configuration data ...
2
votes
0answers
55 views

SSH port forwarding to a host that needs to contact a third named host to access MySQL

We customize and support standard web applications that our customers host on managed servers from different web hosters. Usually, the application consists of a web application in PHP and a database ...
1
vote
1answer
84 views

no internet connection when in private network [closed]

I have an ubuntu server with a public IP, which I can reach with ssh from my local machine. However, when i put this server in a private network, I can no longer reach it with ssh from my local ...
2
votes
3answers
318 views

Weird SSH Issue - Single host not allowing me to login via name

Can anyone explain this, because I have done everything from regenerating keys, to "leaving" and rejoining the domain (Centrify) for an SSH host that I can't seem to get to by a single client. All ...
-3
votes
1answer
72 views

Why this change to /etc/limits does not work

I have made below changes to /etc/limits file for limiting the number of logins for a particular user from ssh. rajan L2 rajan is username here. After making these changes I logged out from ...
2
votes
3answers
486 views

How can I delay sshd login after bad password

How can I delay the retry response from SSH when a bad password is tried or unsuccessful login attempt. I wanted the delay to be 2-3 second more that usual. I could not find any option in ...
1
vote
1answer
34 views

Enable external SSH traffic on selected workstations within my network

I have already enabled an external SSH connection (with public and private keys) to my router, however... I would also like to enable an ssh connection to one of my internal workstations (permanently ...
2
votes
2answers
111 views

SSH multiple TCP connections for single transfer

I'm trying to backup a huge tar archive (150GB) from a root server (Debian Wheezy) to my local storage server (Cygwin). Speedtests with the root server give me about 100 - 120 MB/s download rate and ...
1
vote
0answers
126 views

ssh hangs in Ubuntu MaaS heterogeneous cluster

I have the following issue when using ssh on my local network. I have setup a small cluster of Xeon machines using MAAS. I have installed Ubuntu Server 12.04 on all machines and configured local ...
0
votes
0answers
69 views

monitor network bandwidth via ssh

I'm running a Centos 6.4 server with cPanel. WHM (admin side panel) shows about 100GB of bandwidth this month. However, the server's RTG shows 3.4TB last 30 days, 121GB past 24 hours alone. Doesn't ...
0
votes
0answers
151 views

SSH attempt keeps failing, syn+ack does not reach machine

1 0.000000 10.0.0.1 10.1.1.0 TCP 66 49285 > ssh [SYN] Seq=0 Win=8192 Len=0 MSS=1260 WS=256 SACK_PERM=1 2 0.001160 10.1.1.0 10.0.0.1 TCP 66 ssh > 49285 [SYN, ACK] Seq=0 ...
0
votes
2answers
72 views

unable to access public ip on occasion?

my server is configured to have a public ip on one network card, and a private ip on the other network card... the server was running fine after some time... suddenly i'm unable to access my server ...
0
votes
0answers
104 views

Reverse SSH Tunnel closes after first connection

I am using a reverse SSH tunnel to expose a webserver within my network to the internet. The “inside server” is behind a firewall within a network. The “outside server” is an Ubuntu server with a ...
1
vote
2answers
71 views

SSH connection hangs but eventually connects

I have a CentOS 6.4 server sitting right next to me (same subnet and everything) and when I try to connect to it from another machine via SSH it hangs for about 10 seconds until finally prompting for ...
1
vote
1answer
119 views

Using SSH Tunneling to access website behind firewall [closed]

I hope someone can point out what I'm doing wrong. I've drawn the following picture to illustrate what I'm trying to do. Basically, I'm trying to access a website that is hosted on a server that is ...
0
votes
1answer
121 views

fail2ban block retry count always changes

As title mentions clearly, fail2ban block retry count always changes. I set all retry counts to 3; but sometimes it blocks me after 6 or 7 retries. How can set its behavior a constant value? I added ...
0
votes
1answer
70 views

Providing root ssh access to virtual servers behind NAT? [duplicate]

We are a web hosting company. We have 4 Servers which are running OpenVZ on top of CentOS. Each of the server has around 50 containers running on top of it. We are planning to provide ssh root ...
2
votes
2answers
130 views

SSH + RC4 Cipher: Exactly what is at risk?

I have a situation where a slow Windows machine needs to make periodic automated connections to another machine via SSH. The performance of SSH on this slow machine is so bad it's actually become a ...
0
votes
1answer
52 views

windows can not setup a steady connection with another local network

here is my office net a b |192.168.1.0/24| ———————— |192.168.6.0/24| | | | | ...
1
vote
1answer
180 views

Why is SSH/SFTP failing for commands with larger returns?

We have a SFTP server which was working fine until we added another ISP. The connection to the SFTP server is not going through the new ISP, I confirmed it with tracert. No change was made on the ...
3
votes
1answer
277 views

rsync connection closing right around an hour

I am running some command in cron that does an rsync over two data centers. The connection rate between the data centers is around 1Mbps. I noticed that rsync keeps failing around 2.7GB to 2.9GB of ...
0
votes
1answer
107 views

Can't SSH to localhost

I've spotted a problem on one of my openVZ Containers. There is a tool running for managing git repositories on a server which needs to connect this server by SSH. That tool is running on the same ...
2
votes
1answer
84 views

SSH: Tunnel multiple ports to remote server

See attached diagram. Host A - Windows server Host B - Linux server Host C - VMWare ESXi server From host A I can SSH to host B over the VPN tunnel. I can ping host C from host B, but not from ...
2
votes
1answer
110 views

Good way to run commands on remote computer without its own public-facing IP address (Linux Centos) [closed]

Have a few computers running Linux Centos 6.4. They are connected to an unmanaged switch, which in turn, is connected to a router (Verzion Fios issue). What is a good way to "log in" to one of the ...
1
vote
0answers
21 views

persistent SSH connection while connecting to VPN [duplicate]

I have a Linux machine on the intranet which I can only access via ssh, this machine needs to connect to a VPN using openconnect however when I do that I get disconnected from ssh since the intranet's ...
1
vote
3answers
486 views

persistent SSH connection while connecting to VPN

I have a Linux machine on the intranet which I can only access via SSH, this machine needs to connect to a VPN using openconnect however when I do that I get disconnected from the SSH since the ...
1
vote
2answers
231 views

Tunnel Ethernet Packets over SSH

I have two machines. My laptop and a machine in the local intranet. This machine has next to the network device (for the intranet) a second network card. I want to send raw ethernet frames out of this ...
1
vote
1answer
417 views

autossh failed recreating a tunnel due to different timing

I have problems with autossh in case short network interrupts (up to 60s). This happens daily due to a network disconnect by my ISP in the morning. Even with usage of autossh the ssh tunnel stays ...
0
votes
2answers
55 views

Reverse-back ssh

I have a workstation and I need to connect to a remote server via ssh. Server is under Solaris 11. I can connect to remote server, but when I try to ssh back from remote server to my workstation, I ...
3
votes
2answers
2k views

Puppet Master in VIrtual Machine with Port Forwarding (SSL certificate error?) - SOLVED

I am trying to run a puppet master on a virtual machine, and connect from a client machine, via port forwarding on the virtual machine's host. The details I have a virtual machine running Ubunto ...
0
votes
2answers
162 views

Can't ssh to server running bridged network connection

I have a server with a bridged network interface. /etc/network/interfaces looks like this: # The loopback network interface auto lo iface lo inet loopback # The primary network interface ...
0
votes
0answers
35 views

reduce initial SSH communication messages

The situation: we have some manager servers in Japan which connects to servers in Amsterdam. Since the latency between JP and EU could reach 300ms, the initial login can take up to 6 seconds. Although ...
0
votes
1answer
32 views

Classification of ssh flows in network trafic

My task is to detect ssh flows in the network . Now I am observing ssh flow with wireshark . And I can easily see all ssh flows starts like, "SSH-......". An example: SSH-2.0-OpenSSH_5.4p1_hpn13v11 ...
0
votes
2answers
221 views

How to SSH apache user from a remote guest server on VirtualBox with host-only network?

I have two CentOS virtual machines on VirtualBox . one of them let's say CentOS-1 holds my Web application code . second is CentOS2 . I have two network connections between these two servers : ...
1
vote
1answer
186 views

how to stop eth0 bridged connection via eth1 host only connection in a virtual machines?

I have to simulate unplugged network cable for testing issue to all applications we are developing in my company . I have about 6 virtual machines Cent-OS on a virtual box . from a php web page , I ...
0
votes
1answer
299 views

Cannot Traceroute/ssh outside network

My server cannot connect to ANYTHING EXTERNAL via ssh. I also cannot traceroute to any of them. Machines on the same network work fine via SSH and traceroute. This machine is connected to the ...
5
votes
6answers
10k views

ssh tunnel refusing connections with “channel 2: open failed”

All of a sudden (read: without changing any parameters) my netbsd virtualmachine started acting oddly. The symptoms concern ssh tunneling. From my laptop I launch: $ ssh -L 7000:localhost:7000 ...
3
votes
2answers
95 views

Redirecting SSH through a machine

I'm looking for the simplest way to SSH from my local machine to a remote server through a server in the middle. If there's a permanent way to do this even better.
0
votes
2answers
178 views

Outgoing SSH timing out from Ubuntu

I'm trying to diagnose why an SSH connection is timing out. I have two OSX boxes which can SSH to the remote server fine. I have a two ubuntu boxes, on the same network and subnet which just ...
0
votes
1answer
196 views

Mac Mini stops accepting ssh connections from different network [closed]

I have a strange problem, and I am not very familiar with Mac OSX so I am coming here for help. I have two Mac Minis on a network 192.168.1.* Mac Mini 1 = 192.168.1.10 Mac Mini 2 = 192.168.1.11 My ...
-1
votes
1answer
723 views

ssh can't connect after server ip changed

I have a server with ubuntu installed. After I change the network configuration and restart server, ssh client can't connect server any more. But in the server I can use ssh client to connect itself ...
2
votes
1answer
94 views

SSH Server, pushed to client

Basically I have two networks connected together with the internet, lets call them N1 and N2. On each network, there is a computer, C1 (in N1) and C2 (in N2). There is no port-forwarding between any ...
1
vote
2answers
1k views

SSH multi-hop connections with netcat mode proxy

Since OpenSSH 5.4 there is a new feature called natcat mode, which allows you to bind STDIN and STDOUT of local SSH client to a TCP port accessible through the remote SSH server. This mode is enabled ...
2
votes
1answer
680 views

shouldn't /etc/hosts.deny be intercepting this before it hits ssh logs?

I'm using a combination of /etc/hosts.deny and ufw on my ubuntu 10.04.04 server. Most days, I see failed ssh attempts from machines in the .com.cn domain, reported like so: Failed logins from: ...
0
votes
1answer
260 views

What's the best way to forward traffic on a specific port to another machine?

The setup I have is this: [client01] <-A-> [server01] <-B-> [server02] client01 can access port 9300 on server01 (connection A). server01 can only access port 9300 on server02 ...