Questions tagged [ssh]

Secure Shell or SSH is a network protocol that allows secure communication. For most it is a preferred alternative to Telnet when available. SSH can use automatically or manually generated keys for authentication.

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114 views

I can not connect to switch via SSH after bruteforce

One of the operators has bruteforced HP ProCurve switch via SSH. I have connected to device via console cable and killed all SSH sessions. However, I can not still to connect to device via SSH. How ...
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Deny ssh access from CPEs in all routing-instance - Juniper MX960

I try to deny ssh access from routing-instance CPEs in Juniper MX960 device. I want to know if there is a way to deny only ssh access attempt from any routing-instance.
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Is there any method for insert ssh key in putty when i need to connect cisco router?

I need to connect to cisco router and use private key to connect, but i need to use to putty for ssh. Is there any way?
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37 views

Problem Forwarding Port 22 for SSH [closed]

I'm trying to forward port 22 so I can SSH into my PC from a different network but it doesn't seem to be working. I can do ssh mihkel@my_public_ip from the network that the PC is on but it doesn't ...
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56 views

Prioritizing SSH, Telnet, TACACS in Cisco IOS

For Prioritizing SSH, Telnet, TACACS locally generated traffic on Cisco ASR running IOS XR, we have: ssh server dscp 48 tacacs-server ipv4 dscp 48 Need the same for cisco GSR: 12416/PRP running IOS. ...
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1answer
91 views

What is the point of Junos outbound SSH service?

Junos outbound SSH service makes a SSH connection from network device to SSH server. What is the point of this? Does it allow the server to somehow make the SSH connection back to network device using ...
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1answer
43 views

Korenix Switch JetNet 4508v2 SSH Problem

Does anybody know, or has anybody worked with Korenix JetNet 4508v2? This Switch has a very important Bug in the Firmware. SSH is working fine, but for a period of time. Then, ssh is not working ...
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2answers
297 views

Cisco 3750G - SSH Diffie Hellman Group 1 SHA1 Error

I recently implemented SSH configuration on my 3750G switch stack. I have -set the domain name -generated the rsa key using 2048 bits -ensured that the vty lines are set to transport input ssh Now ...
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1answer
67 views

Juniper EX Switch sending TCP reset on SSH connection randomly

So as stated in Title I'm observing that one of our switch randomly send RESET flag in TCP and ends the ssh connection in the middle and sends and Window size of 0 as well. Randomly it refuses to ...
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1answer
38 views

Hp procurve 2510 ssh problem

My app connects to switches via ssh to gather info from them. I can connect to any model except this one. I get the authentication error from the switch yet i can connect via putty with the same ...
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1answer
404 views

SSH failing from Cisco to Juniper - SSH2 CLIENT 0: Channel open failed, reason = 1752134516

Not able to SSH from Cisco IOS 15.2(2)E8 to Juniper 14.1X53-D48.1 HOST#show debugging SSH: SSH Client debugging is on HOST#ssh 1.1.1.1 *Feb 11 15:55:47.448: SSH CLIENT0: protocol version id is - ...
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1answer
280 views

Restrict VTY SSH access to only MGMT VLAN and loopback

For the sake of the fact that i'm not allowed to share actual configuration, every posted config below is made up or altered. We have more than 250 locations spread over our country. All locations ...
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1answer
30 views

In port forwarding, is the ultimate destination decided solely by the intermediary entity?

In port forwarding, is the ultimate destination to connect to solely decided by the intermediary entity which provides port forwarding, not by an application client? Although the page mentions ...
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1answer
20 views

Does “tunnel” here mean the same as tunnelling as in SSH?

From book Data and Computer Communication Tunnel Unlike the proxy and the gateway, the tunnel performs no operations on HTTP requests and responses. Instead, a tunnel is simply a relay point ...
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1answer
61 views

cisco catalyst creating user fails

I took over a couple of Cisco 2960x switches. They are configured with a telnet login. Now that telnet isn't that great (and my colleagues are afraid of CLI but might have to configure things too) I ...
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1answer
191 views

Login local , login synchronous

I dont understand what those two comands mean when im enabling ssh on Vty-line. Can someone please explaim me please whatthose comand do and why i need to use them?
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121 views

IP Domain-name on aggregation layer switch

Hi I was trying to generate ssh key for a switch I read that , ssh key is generated as a combination of hostname and domain-name I created a domain name like test But doubt is , why isn't the ...
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1answer
37 views

Random intercontinental TCP streams are slow

I have a home server in New Zealand and a remote server in Amsterdam of the following configuration: I have a simple test script: #!/bin/bash for i in `seq 1 20`; do scp root@remoteserver:~/...
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20 views

VPN Configuration [closed]

Im trying to reach a network at a remote site. I need to have my machine configured to have access to equipment on this network(not computers). I have a debian machine located on this network but the ...
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1answer
107 views

CISCO IOS's feature Secure Shell Version 2 Enhancements for RSA Keys

I have a switch C3750V2-48PS with IOS ver. 12.2(55)SE5. I wanted to copy to it public key for the ssh client but I do not have following command available Switch#configure terminal Switch(config)#ip ...
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1answer
28 views

Connecting centos server through Putty [closed]

I have been facing following problem for several days, but i can't find an exact solution. So I have Centos server on Vmware Workstation and i want make a ssh connection through Putty. But i receive ...
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1answer
4k views

“ssh: connect to host myserver port 22: Invalid argument” (intermittent, ipv6, link-local address, dhcp hostname) [closed]

Since this question is off-topic I moved it to Super User. But I was unable to delete it. Here is the new location. Here is the original question: I'm trying to connect to a headless server via my ...
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3answers
493 views

Bypassing a Cisco Terminal Server Menu

The guys at a config center connect to devices by: placing them on a management rack, and plugging them into a management switch by means of some hwic/RJ45 reverse telnet connection. When you remote ...
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3answers
374 views

Cisco ISR4450 Router SSH access denied

I configured an ssh connection on an ISR 4451 router, which always worked perfectly. For several weeks, every time I want to connect with Putty via SSH, I get an "access denied". I also cant connect ...
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1answer
49 views

Remote access ssh on Ubuntu [closed]

I want to enable remote access to my machine. I have thus far enabled port forwarding on router. Lets say the static local ip address of the machine is 192.xxx.x.x. We will cal the ip address that is ...
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0answers
84 views

SSH into device attached to another router [closed]

I saw this questionwhich looks kind of related, but I'm not sure as the answers are too confusing. Basically, I want to SSH into my Raspberry Pi from my laptop. Eventually I want to have the Pi ...
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2answers
360 views

How do I automate ssh sessions with a Router Ericsson IPOS?

I am trying to automate the healthcheck process of a router by running a centralised script from a linux server. I am so far able to access the router server without password prompt using ssh and rsa ...
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1answer
491 views

Cannot ping or SSH into new Catalyst 2960-CX switch from the server VLAN (1)

I recently setup a Cisco Catalyst 2960-CX switch at work (I'm a SysAdmin at a SMB). Our workstations use VLAN 3, but our servers use VLAN 1. The management IP of the new switch (in VLAN 3) is 192.168....
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1answer
128 views

How to authenticate logins to Ericsson(IPSO) routers without password from shell server

I am very new at networks. I am attempting to automate the health check process of a system network from the main server being a shell OS. I have been successful for some network nodes which are ...
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1answer
93 views

Pinging/ssh-ing into just trunk interface. How is it done? [closed]

I'm a junior network technician and I was tasked at work to do a switch upgrade. The most important part of this task is to set up SSH so we can at least get into the switch remotely configure once ...
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1answer
75 views

SSH and port forwardings in both directions [closed]

I can't undersatand this : All communication happens using SSH with port forwardings in both directions Any help? Thanks.
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1answer
72 views

Cisco: Return key needed after remote ssh console access using rotaries

I´m configuring a remote ssh access with TACACS to a console in a Cisco 2911, on a rotary port. When the access is granted after a successful ssh authentication, an Return key is needed to access the ...
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4answers
7k views

Switches 'HPE OfficeConnect 1920S' - Enable SSH / TFTP Services

We need to manage switches HPE OfficeConnect 1920S remotely but only HTTP/HTTPS Administration is available. HPE 1920S has an special operating system, neither Procurve nor Comware. We are looking ...
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1answer
2k views

Can you SSH to a Cisco switch without a Username

Is there a way of setting up a Cisco swtich (Cisco Catalyst 3850 12 Port GE SFP IP Base - its not arrived so I don't know the IOS) to allow SSH without specifying a USERNAME The customer currently ...
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1answer
73 views

How does a network switch affect SSH? [closed]

My job requires that I have access information on multiple machines via SSH. Unfortunately, due to some ongoing remodeling, there are now more machines than there are available ethernet ports, and I ...
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3answers
87 views

How do protocols get blocked even over open ports?

This might be a stupid question, but I'm wondering how a network blocks a protocol like SSH even if the server is listening on port that isn't blocked, like 80. I've even tried port forwarding an non-...
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0answers
147 views

Monitoring interfaces on VyOS then SSH output to another machine (Security Onion) [closed]

I am trying to figure out the best way I can monitor interfaces on a VyOS interface from a Security Onion instance using Squil (Snort alerts etc). I am thinking SSH to VyOS to activate monitor ...
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1answer
855 views

Cisco TACACS authentication config

I'm inheriting a DoD network (completely separated from the Internet). I'm looking at the configs and I'm seeing a bunch of stuff I think isn't needed but I've never used TACACS, just Radius. The ...
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1answer
2k views

Cisco SSH disconnect

I have a Cisco 867VAE with 15.5(3)M which is disconnecting from a particular legitimate SSH client with %SSH-4-SSH2 _UNEXPECTED_MSG: Unexpected message type It's on a bench, not in service. I have ...
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2answers
11k views

Telnet or SSH into a Cisco router

I would like to log into a Cisco router that is in a LAN via telnet or ssh as user <username> with a password <password> only from machines in the LAN 192.168.2.0/24 About the user: I ...
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2answers
2k views

Cisco `ip ssh source-interface` refers to server, client, or both?

If I do ip ssh source-interface g0, that restricts: which interface the Cisco device listens for SSH connections, which interface it is allowed to use for the client to connect to other SSH servers, ...
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2answers
163 views

SSH Idle Timout Prevention on Router

I know how to prevent a SSH idle timeout on client and server side, but is there a way to configurate this on gateways? I am asking because our company network consists of hundreds of clients and ...
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3answers
2k views

When using SSH, why it doesn't ask for a username and it's corresponding password?

Here is the running-config for the line vty: line vty 0 4 password 1111 login local transport input ssh line vty 5 15 password 1111 login local transport input ssh However, when I type ssh -l domain-...
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1answer
837 views

Cisco IOS public-key auth with privilege 15 and no password

From IOS 15 we can log on Cisco IOS with RSA public key authentication. However we still have to assign a password to the user. If we don't the user can log on without any password (and without the ...
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1answer
3k views

How to fiter non SSH traffic in Wireshark

I am trying to monitor behaviour of packets from my PC -> VirtualBox machine which represents a virtual router, and I have established SSH session to it. My question is, how to filter out all SSH ...
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3answers
847 views

Can I limit Cisco IOS login to specific users?

I have a Cisco IOS router that is used for WAN access. I have 2 additional users defined with less privilege to check status and to use ssh. I wonder if it is possible to restrict certain user to only ...
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2answers
2k views

JunOS ssh debugging

Our Junipers will not accept my ssh keys when I provide them from my favorite Windows client. On a FreeBSD machine, I would restart sshd with the -d flag and just watch the output to discover why the ...
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1answer
949 views

Could accessed sites over an SSH tunnel be tracked by ISP? [closed]

I created an SSH tunnel and using it as SOCKSv5 proxy on Firefox. I checked whatismyipaddress.com and some other sites, they could not detect a proxy on my computer and shows my location on the server'...
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1answer
589 views

SSH access to router via inband and OOB ports

I am aware of management VRF where inband port and OOB port on router can be part of and support SSH access to the router from both management port and network port. In this case inband port(network ...
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1answer
5k views

Configure SSH cipher on Cisco IOS 12.2(55)SE7

Today a customer contacted me because he has upgraded his MacBook to MacOS X Sierra and since then, when trying to access a switch via SSH he got the message Unable to negotiate with 10.XX.XX.XX ...