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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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What is generating the /isan/etc/dcos_sshd_config file?

I posted this on the main stack overflow page, but then I remembered that this niche existed. Figured it was worth a cross-post... During a recent Nessus security scan at work, some of our NX-OS ...
Joe Guichebarou's user avatar
2 votes
1 answer
123 views

Cisco 9300 switch doesn't connect via SSH

I have a couple of switches that are trunked via a LAN cable from another switch. I noticed that these switches sometimes have a hard time to SSH into. I get the error: "Connection timed out"...
Rick151's user avatar
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SSH service stops and comes back

I have a logical switch (a stack of DELL switches N1548s). For the last 2-3 days, the ssh service on the switch stops for 1 minute and then comes back. It happens 2 or 3 times a day. Has anyone seen ...
Kabamaru's user avatar
0 votes
1 answer
3k views

SSH Config on Nexus Switch

Having trouble configuring SSH on 2 Fiber Channel Switches (NX-OS). Any Cisco experts here that can help? I am pretty new with Cisco and having trouble looking for documentation on SSH config for ...
John Vianney Paja's user avatar
2 votes
2 answers
530 views

Cisco ASA5505/6 - public key authentication does not work with OpenSSH client

I have been unsuccessful at getting public key authentication to work per Cisco Systems on any of our ASA5505 or ASA5506 routers. Despite my best research and efforts, I still get challenged for a ...
Frobozz's user avatar
  • 171
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2 answers
94 views

Are UDP packets "retransmitted" when dropped by an edge router inside an SSH Tunnel?

A network architect was recently asking about enabling DSCP on tunnels that I create for a VPN-like solution I maintain using ssh to maintain tunnels on linux devices. I thought this was odd because I ...
Peter Turner's user avatar
0 votes
1 answer
72 views

Can't find a device on my network [closed]

I have a device on my network that is at a static address (192.168.3.1). This device is connected to a network switch, that is also connected to the rest of my network. My problem is that I need to be ...
Will's user avatar
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1 answer
1k views

How to generate cisco key-hash string

cisco IOS stores public keys used for authentication as hashes. cisco obviously does not store the key itself because you can simply copy these key-hash lines between machines and you can authenticate ...
ericx's user avatar
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49 views

How do I port forward multiple SSH servers? [closed]

I am very new to networking and I have set up ssh on my raspberry pi. I also have ssh on my windows 10 computer. Here is my problem: I would like to have ssh port forwarding on both my raspberry pi ...
SirFire's user avatar
  • 11
0 votes
1 answer
228 views

L3 Switch as network core and ssh connections

We have several L3 switch as core for our sites (central and remotes). These switchs have multiple IPs for vlan routing. These IPs are gateway for vlans. Is it possible to avoid ssh connections for ...
Alex Lum's user avatar
4 votes
0 answers
503 views

SSH to ASA on Exit Side Of VPN Tunnel

I have a functioning L2L tunnel between two ASA devices (HQ-FW1 and Branch-FW1 on the diagram). HQ-PC2 - 192.168.10.21 HQ-FW1 eth0 - 192.168.20.2 (outside) HQ-FW1 eth1 - 192.168.10.2 (inside) Branch-...
DavidM's user avatar
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SSH Key Generation

I have an issue where I can't SSH into to switch due to a connection refused fatal error after a switch rebooted. One of the rsa key that is in the switch that I think is used in the switch is : Key ...
John's user avatar
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0 votes
1 answer
2k views

Computers in an unmanaged switch cannot communicate with one another [closed]

TL;DR: I have > 2 computers in an un-managed switch which can't communicate with one another i.e. can't ping or ssh among one another. Long story: As per the diagram my router can reach the ...
shriek's user avatar
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1 answer
1k views

How to increase the screen buffer size on a minicom session screen [closed]

I have been trying to increase the buffer size on the router cli which I am connected through a serial cable via minicom session but I am unable to do it. I am connecting to a linux server through ssh ...
Rakesh Nittur's user avatar
0 votes
1 answer
1k views

ssh: Could not resolve hostname (updating hostname for machine on local LAN) [closed]

I have connected a raspberry pi 4 running ubuntu 20.04 to my local LAN over wifi. From my laptop I can SSH to the raspberry just fine with: $ ssh [email protected] Welcome to Ubuntu 20.04.1 LTS (GNU/...
u123's user avatar
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1 answer
110 views

Easiest setup to replace jumpbox forwarding [closed]

In order to connect to some of machines, what I currently do is: Connect to VPN (using AnyConnect) SSH to my jumpbox via VPN For every single machine that I want to access using ssh, I have to map ...
Bojan Vukasovic's user avatar
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1 answer
111 views

What can I use to display VPN instance instead of stelnet?

How can ı connect VPN service with use ssh in Huawei Atn980c ? Which command? I researched but i didnt different command. I found only this command; stelnet x.x.x.x (VPN instance) (service name) (port ...
user70779's user avatar
1 vote
1 answer
308 views

ssh from cisco with fake source-ip

I have two cisco devices directly connected. router1 = 10.70.223.96/31 router2 = 10.70.223.97/31 on router2 there is an admin ACL permit 10.64.95.0 0.0.0.255 so I can't only SSH router2 from that ...
exeral's user avatar
  • 244
1 vote
2 answers
3k views

Can't log in after admin password change

I reset my admin password with below command: #Set system login user admin authentication encrypted-password <new password> But now i can't login to my device, what can be the reason?
ario's user avatar
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1 vote
1 answer
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Lubuntu 18.04 can't SSH to Cisco Router: no matching key exchange method found. Their offer: diffie-hellman-group1-sha1 [closed]

I'm not sure if this problem caused by Lubuntu or Cisco Router side. Lubuntu = 192.168.1.100 Cisco Router = 192.168.1.1 Ubuntu 18.04.4 LTS user@linux:~$ lsb_release -a No LSB modules are available. ...
Sabrina's user avatar
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0 votes
2 answers
190 views

Opening port 22, is there risks? [closed]

I have a question for you, my situation is this: I have an ip cam that have an HTTP Panel through which I can watch live recording of the camera. I need to watch my io camera also from remote, but i ...
Filippo Pino's user avatar
1 vote
2 answers
3k 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 ...
Ruslan's user avatar
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2 answers
2k views

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.
Pablo Xavier's user avatar
1 vote
2 answers
94 views

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?
Behzad Soltaniyan's user avatar
0 votes
1 answer
117 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 ...
Mihkel's user avatar
  • 101
0 votes
1 answer
556 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. ...
Blake's user avatar
  • 57
0 votes
1 answer
1k 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 ...
Martin's user avatar
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0 votes
1 answer
156 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 ...
Jim Pap's user avatar
  • 419
2 votes
2 answers
3k 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 ...
Craken's user avatar
  • 681
0 votes
2 answers
757 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 ...
Terminator's user avatar
3 votes
1 answer
576 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 ...
user19215's user avatar
  • 313
2 votes
1 answer
1k 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 - ...
user avatar
2 votes
1 answer
1k 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 ...
user avatar
3 votes
1 answer
41 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 dynamic ...
Tim's user avatar
  • 1,555
1 vote
1 answer
45 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 ...
Tim's user avatar
  • 1,555
2 votes
1 answer
246 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 ...
Kenny Blankenship's user avatar
0 votes
1 answer
1k 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?
Vani's user avatar
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1 vote
2 answers
369 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 ...
PDHide's user avatar
  • 227
2 votes
1 answer
101 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:~/...
Sam's user avatar
  • 121
1 vote
0 answers
28 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 ...
MDK's user avatar
  • 111
4 votes
1 answer
199 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 ...
kkris1983's user avatar
  • 177
1 vote
1 answer
68 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 ...
Simral Abdurahim's user avatar
0 votes
1 answer
19k 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 ...
Metamorphic's user avatar
2 votes
3 answers
1k 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 ...
Matthew Bruna's user avatar
2 votes
3 answers
1k 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 ...
Sven's user avatar
  • 51
0 votes
1 answer
308 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 ...
LeastSquaresWonderer's user avatar
1 vote
0 answers
121 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 ...
audiFanatic's user avatar
1 vote
2 answers
860 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 ...
tthhss's user avatar
  • 33
1 vote
1 answer
1k 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....
SamAndrew81's user avatar
1 vote
1 answer
312 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 ...
tthhss's user avatar
  • 33