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Trending Discussions on Telnet
QUESTION
I try connecting to my "RUNNING" ubuntu AWS instance on AWS on port 22 (ssh) but it failed with the below error.
...ANSWER
Answered 2022-Mar-13 at 20:53I used the below steps to recover and fix the instance.
It took about 2 hours for the process to complete.
I'm now able to connect alright.
QUESTION
Let me explain my use-case here,
I wanted to give a try to vault in my local, so I configured VAULT_ADDR
as:
ANSWER
Answered 2022-Mar-07 at 09:55I was able to figure out solution for above issue. Basically I executed below steps.
- First I started vault server in above machine ( '123.456.XXX.X' ) by below command
QUESTION
I am trying to configure listmonk with AWS EC2 and sendgrid. However I'm getting timeout while sending mails. I tried debugging using the documentation and when I try to telnet, I'm getting timeout:
...ANSWER
Answered 2022-Jan-23 at 17:22By default, AWS blocks outbound traffic on port 25, and you have to file a request to get the restriction removed.
I usually just use a different SMTP port instead of trying to get port 25 opened. SendGrid's documentation states:
SendGrid accepts unencrypted and TLS connections on ports 25, 587, & 2525. You can also connect via SSL on port 465. Many hosting providers and ISPs block port 25 as a default practice. If your Telent session continually times out or will not connect using port 25, it is likely that your ISP or hosting provider is blocking the port. You can contact your host/ISP to find out which ports are open for outgoing SMTP relay. We recommend using port 587 to avoid any rate limiting that your server host may apply.
I suggest just switching to use port 587
QUESTION
We were able to ssh to the EC2 instance using the connect details until today; when it stopped working and I get the below error:
...ANSWER
Answered 2022-Jan-22 at 06:41The Connection timed out
message normally indicates that there is no network connectivity.
In most cases, this is due to the Security Group.
The steps to check it are:
- Select the instance in the Amazon EC2 management console
- Go to the Security tab
- Check the Inbound rules
To permit an SSH connection, there needs to be a rule that permits port 22 (SSH) and the source set to your IP address or from the whole Internet (0.0.0.0/0
) -- preferably only your IP address so that everybody else will be blocked.
When launching an Amazon EC2 instance from the console, it will default to creating a new Security Group called launch-wizard
. However, it is generally better to create your own Security Group with a useful name and only the rules you want. You can then re-use that Security Group in future for similar instances.
QUESTION
I want to do a basic rust and tokio implementation of an echo server,the code is based on Creating a Chat Server with async Rust and Tokio,the server works perfectly, but I have problems with the client because when the client is a program that just writes it works fine, but when you want it to work like the telnet command (write and read) it doesn't work, it hangs reading and the message doesn't even arrive
...ANSWER
Answered 2022-Jan-06 at 07:39The server doesn't send a newline, but the client is waiting for it. It works with telnet because telnet prints characters as they arrive without waiting for a full line.
QUESTION
I have a Window application that can be connected to a device through Serial Port.
I would like to have a sort of remotization of the device.
To Do this the device is connected to a remote board with a processor that run Linux OS and I'm using Ser2Net to transport serial communication to Ethernet Protocol.
Of course if I connect it via Telnet I can connect the remote device but this is not my target.
I have a Windows application, as mentioned before, and the only way to connect it to the system is via COM port.
Is there any easy-way to make this serial over ethernet be spawned as a Virtual COM?
Thank you! Ale_Trex
...ANSWER
Answered 2022-Jan-04 at 12:46as far as kunif just commented my post (thank you again) I would like to share the info as an answer to make everybody has my problem, able to fix it properly.
Following this link you'll get instruction that make you able to spawn a virtual COM to connect to an APP can be link to a generic serial over ethernet.
WINDOWS - ComPort over Network
This works fine with me. Hope it works with you too.
PS. instruction would introduce you to both Windows or Linux approach to the issue.
Ale_Trex
QUESTION
I have a problem with saving output from the telegram. My problem is, from server I am getting data every minutes. My VERY SIMPLE CODE can save this continuous data into a .txt file.
But what I want is, to store this data in a daily folder. From this code, while running, it creates current day folder but keep adding next day data in the same folder and also in the same file.
It will be very helpful for your help/suggestion to solve this problem.
My sample code is:
...ANSWER
Answered 2021-Dec-22 at 17:06Oh now I've got it, 'echolog' is your function, I though it's some app at first sought. It could be simplified like this:
QUESTION
I'm sorry, I don't know how to phrase my question better.
For homework, I've been given a telnet server IP and Port that I connect to with PuTTY.
I was wondering if it is possible to view the source code of that server?
It is my first time learning about telnet and using PuTTY, and I don't know anything about it. I was just wondering if it is possible to view the source code of a telnet server, and if it is, how to do it.
Thanks.
ANSWER
Answered 2021-Nov-01 at 15:00I guess the idea behind this question is that if you're looking at a webpage you can do "view source" in the browser and look at the HTML, CSS, and Javascript that make up that page.
Of course, what you're seeing there is just the "client side" part of the web page. You can't click "view source" on Facebook and see the code that accesses their database, decides what to show in your feed, picks out the ads you're going see, etc., because that's all done server-side. Nor can you see the source code for the web server that handles your incoming connection, etc.
In the case of a telnet server, the "client side" portion is just the raw text you're seeing. There's nothing [1] analogous to what you'd see if you did "view source" in a browser beyond what you're already seeing in your telnet window.
Of course, if the program that they're running on the server side is publicly available, you may be able to download and read its source code. This is analogous to how, if a web site is running on apache or nginx, you can just download the source code for those and read them. But this is not something that's sent over the telnet connection.
[1] Slight nitpick: I guess technically if the text you're seeing has VT100 control sequences to highlight or colorize the text that is sort of analogous to HTML code, but it's very limited. If that's what you want to know about, you could either set your telnet client not to process those sequences in order to see what they look like, or you could capture the network traffic with something like tcpdump. But you can also just look up VT100 control sequences.
QUESTION
I have a task: to do telnet commands through ssh session.
I have read similar problems:
- Running telnet command on remote SSH session using JSch
- telnet through SSH
- Execution hangs after Running telnet command on remote SSH session using JSch
And I wrote the code (with lib https://mvnrepository.com/artifact/com.jcraft/jsch):
Class Ssh:
public class Ssh { private final String USER; private final String PASSWORD; private final String HOST;
...
ANSWER
Answered 2021-Sep-29 at 11:05I debugged your example and in my case, I needed to wait for the program, which you connect via telnet, until it is ready to receive a command.
In the second step, you can send your command and the exit command to stop the telnet, so you are reading from the stream until it has stopped by saying "Connection closed...". Be aware, that exiting from telnet can have different commands, some use quit
, some other use exit
or only wait for a termination signal.
QUESTION
I am trying to connect to multiple switches via telnet and get an output with CPU usage. One thread works and shows the proper CPU Usage. The second thread does not do anything. How do I get two threads working with the same command as the first.
...ANSWER
Answered 2021-Oct-05 at 02:26You create connection to only one switch
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