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Questions tagged [telnet]

For questions about Telnet, a protocol for bidirectional interactive text-oriented communication with remote hosts via virtual terminals. It is defined in RFC 854.

Telnet is a protocol for bidirectional interactive text-oriented communication with remote hosts via virtual terminals. It is defined in RFC 854.

Telnet provides no inherent security and so is becoming less commonly supported. On modern UNIX-like systems it is usually replaced with more secure and flexible SSH protocol.

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Telnet to smtp server port 25 --> Connect failed

I want to send an email via telnet. When I typed to the command prompt telnet 'smtp_servername' 25 the following message appears Could not open connection to the host, on port 25: Connect failed Server name and listening port are correct. I have…
Albert
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All Outbound Traffic Uses IPV6

I have a Debian 10 server which has postfix installed, each time I try to send outbound mail traffic, the server uses IPV6 over IPV4. This causes postfix to log Connection timed out. I have tried sending packets to google SMTP server using telnet,…
Ruby
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Server won't respond to ping

I have a server that won't respond to pings, but I can remote desktop to it. The server has two LAN connections. Each has the same subnet mask and default gateway, but separate IP addresses. I'm not sure why there are two LAN connections, but…
John
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emulate telnet over ssh

I have a client/server application that work over a telnet connection, and it does not support SSH. Basically the client opens a telnet connection to the server, which starts a specific shell, and the client sends commands over the telnet connection…
Jose L Martinez-Avial
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Unable to connect to AWS ec2 instance public ip via browser

I've newly installed Openresty as the web server on an ec2 instance and its currently running but I can't even view the welcome page when I try to navigate to it via my public ip address at the browser. Anyone can tell whats the issue I'm having? So…
Joshua
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Why do we need the host name again when downloading the webpage by using telnet?

I learned you could use telnet to download a webpage(making http request), like telnet www.example.com 80 GET HTTP / HTTP/1.1 HOST: www.example.com then the output would be an html source page or something. My question is if we had specified…
Hang
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How to set the mode of port? access, trunk, general

I tried to set (change) the mode of my port, and I read the book and followed it step by step. But I still get a lot of error. There were what I input. (Routing) (Interface 0/3)#switchport mode general …
Steve
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Send login credentials and commands using shell script via telnet

I'm trying to run a couple remote commands on a box that will not give me a normal shell (it's a device with a proprietary shell). I'm also running the command from a device with a limited set of resources so I can't add something like Expect. I…
Jason
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Is there a security risk to just having the telnet client installed on Windows?

I was recently asking for the telnet client to be turned on on my Windows install. The devops guy told me it was restricted because it passed people's usernames and passwords through clear text. I assume he is referring to using it to connect to an…
JGleason
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Telnet SMTP gives OK but not accepted or queued message and mails not received

I am trying to debug a CDO.Message.1 error '80040213', The transport failed to connect to the server. So I am testing the connection to the SMTP server via telnet. After entering the DATA I am getting this response: 250 ok 1515609773 qp 24996 On a…
Brad Mathews
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telnet: Unable to connect to remote host: Connection timed out

Setting up a postfix server, trying to figure out why it's not working. Here's a command that I ran while troubleshooting. I expected to be able to connect, but could not. lol@foldingmachine:~$ telnet a.mx.mail.yahoo.com 25 Trying…
jcarpenter2
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Unable to telnet particular server IP from our CentOS 7.2 server

I am unable to telnet a partner server IP (103.x.x.x) from our server. I am getting following error telnet: connect to address 103.x.x.x: Connection timed out but I am able to telnet other server IP from our server. Also I am able to ping that…
user231410
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Linux - opened port, but still fail to connect to it using telnet

I'm currently working on CentOS 7.3. In order to activate SNMP, I installed it, configured it and successfully started the service using the firewall-cmd command. Now, I realized that I need to open the port 161 to make the SNMP start…
marshallslee
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Unable to telnet at port 80 AWS EC2 instance

I have allowed port 80 on my ec2 instance, and this is my iptables rules on it Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy DROP) target prot opt source …
YATIN GUPTA
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DKIM Key validation fails when using Mail Command

I have a relay server that I am using to send emails. I am signing outbound emails using dkim. When I send the mail using telnet the gmail logs look like this: Received-SPF: pass (google.com: domain of user@test.com designates X.X.X.X as permitted…
user2019182
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