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.

Filter by
Sorted by
Tagged with
0
votes
0answers
25 views

Would any port check command (telnet) work if sever application is not running? [closed]

This may be a simple yes and no question, but I haven't had luck finding answer anywhere. I am tasked with the installation of certain tools on server machines (RHEL based). The issue is, I need to ...
0
votes
1answer
64 views

how to build a telnet middleware server

I need to comunicate an old crm system with a new asset. Crm system can only send fixed commans over telnet connection but this new asset can only receibe commands via api rest. Im planning to ...
0
votes
0answers
22 views

BDAT mail command in Postfix

I've been trying to research the BDAT command, specifically in connection with Postfix. I wasn't able to find a huge amount of information and I have 3 questions. (1) As far as I can tell, Postfix ...
1
vote
1answer
21 views

Service sometimes working, sometimes not working

I want to connect Centos B's 33060 port from Centos A. I can ping Server B. [root@serverb ~]# ping 10.42.40.182 PING 10.42.40.182 (10.42.40.182) 56(84) bytes of data. 64 bytes from 10.42.40.182: ...
0
votes
0answers
24 views

Telnet connected but get timeout when sending any request

I have a server A which has limited connection to some servers wants to talk to a server B (firewall rule is allowed). When I am using telnet to test connection to B, what I observe is that it says ...
0
votes
1answer
130 views

Execute command on LINUX via PUTTY from Windows [duplicate]

I want to open a putty session (SSH) from command line and immediately execute on the remote machine a specific command. Something like: putty.exe -ssh user@host -pw pass123 < "cd /some/...
-1
votes
2answers
158 views

Telnet not working with windows 10 [closed]

I am using telnet on windows 10. I would like to manually set get requests to chosen server. If I type (just example it can be any site): telnet www.cnn.com 80 for a second I see message '...
0
votes
2answers
173 views

Test TLS TCP Endpoint

I have TCP endpoint for a Service running with TLS (Self-Signed) Certificate. To test this endpoint I use openssl s_client -connect service.domain.com:5050 which prints CONNECTED(00000006) nothing ...
1
vote
0answers
22 views

Windows Server 2012 Blocked Network Activity

I am trying to telnet some other machines from my Windows Server 2012 computer, and also to test the SMTP connection using telnet again. Although I have created all the required Windows Firewall ...
0
votes
0answers
29 views

VMWare network: some guest service not accessible from host

I have elastic search installed on a guest (CentOS7) on my vmware host, I am able to visit it on the default port 9100: If I access it from the guest directly, it shows differently: If I telnet from ...
1
vote
1answer
195 views

Postfix (Imap) with Dovecot: no auth available

I'm using Dovecot to get Imap access to my mail server (on Raspbian). I'm using system users and am able to successfully test logins (doveadm auth test ...). But I'm not able to get auth option via ...
2
votes
1answer
848 views

Testing connectivity between Unix and Windows servers

I am doing a failover activity between 2 data centers. In 1 data center, 1 Oracle database on Linux is replicating data to 1 SQL Server database on Windows using a replication tool. There is storage ...
1
vote
1answer
1k views

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 ...
2
votes
0answers
33 views

How to Open Telnet Console in post section of Kickstart [closed]

I want to configure external VxWork based device in post section of kickstart file, this accept telnet based commands. I found following #!/usr/bin/expect -f send -- "terminal length 0\r" expect "*?...
0
votes
2answers
196 views

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 ...
0
votes
0answers
343 views

Telnet shows blank screen on port 443 but TCP handshake not done

From my windows 10 machine (172.18.164.50) if I do a telnet 172.20.187.10 443 It shows a blank screen as if it is connected. It is totally unespected because in theory a firewall is blocking the ...
0
votes
1answer
108 views

How can I abort a telnet connection attempt? [closed]

Suppose I execute the following in command prompt: telnet XXX.XXX.XXX.XXX 80 half a second later, I realize it would never connect (for whatever reason). I want to abort the connection attempt ...
0
votes
1answer
43 views

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 ...
-1
votes
1answer
533 views

Why smtp server can not be telnet?

https://www.webdigi.co.uk/blog/2009/how-to-check-if-an-email-address-exists-without-sending-an-email/ I am following the above instruction to telnet an email server of gmail. But I got an error. ...
0
votes
1answer
1k views

EXIM SMTP allows to send mails without login / authentication via telnet to any domain

I'm ashamed, but I have to ask for help. My server is being used for sending spam, I've found out I can simply connect with telnet (edit: from any server in office, home and even directly from CMD/...
1
vote
0answers
71 views

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 ...
0
votes
1answer
438 views

How can I enable SMTP receipt through firewalld on Linux?

I've leased a dedicated, lightly-managed CentOS7 box from a hosting company. The host came with firewalld installed and running and with its iptables preferences pre-imposed. I was not expecting ...
0
votes
2answers
2k views

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 ...
0
votes
0answers
423 views

SSH and Telnet connectivity issues. It connects sometimes and sometimes it does not

I have come across a problem with SSH and Telnet wherein the connectivity is slow and drops multiple times. But I see that my network has no problems. When I ping a server, it gives me ttl of 127, ...
0
votes
0answers
621 views

telnet 3-Way Handshake

I'm trying to see a simple 3-Way Handshake using telnet on the Client side and tcpdump on the Server side, both Client and Server are inside VMs. I use telnet this way : telnet 172.10.10.21 80 On ...
3
votes
3answers
985 views

telnet non interactive: connection closed by foreign host

if I do telnet host_ip port < /dev/null Trying host_ip... Connected to host_ip. Escape character is '^]'. Connection closed by foreign host. By checking the wireshark, the client side sends tcp ...
-2
votes
1answer
675 views

Telnet through a serial terminal server

I have a Perle IOLAN device like this, and one configuration option is for a serial terminal. The corresponding configuration screen. As you can see, one option is to configure the terminal to ...
1
vote
1answer
973 views

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 ...
4
votes
1answer
5k views

Use telnet to check that VNC port is open

I am supposed to connect to a Mac VNC/ARD server. Let's say that the Mac VNC server has the hypothetical IP address 8.8.8.8. I want to check if the Mac VNC server even listens to the default VNC port ...
1
vote
1answer
12k views

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:~$ ...
0
votes
2answers
85 views

How can I run an interactive console program when a user connects via SSH

Looking to start a python program when a user connects to my SSH server. An example use case would be a MUD program (except using SSH and not Telnet). If they somehow exit the program or it errors out,...
0
votes
1answer
1k views

Check if HTTP Methods have been Allowed and Enabled on Localhost

I’m running Apache/2.2.15 (Unix) on a RHEL system. My LAMP is running on localhost. I want to check if the HTTP methods: POST GET PUT DELETE are allowed and enabled. I’ve read that they can be ...
0
votes
0answers
149 views

OpenVPN connected, partial internet [IPv6]

I've got an OpenVPN server set up and it works wonderfully, with all internet traffic using the VPN connection. On one specific WiFi network, I can use telnet/openssl s_client to connect to web ...
1
vote
1answer
35 views

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 ...
3
votes
1answer
6k views

Connecting to Hotmail's IMAP Server using Telnet [closed]

Hotmail appears to have two separate IMAP ports: imap-mail.outlook.com 993 And: imap-mail.outlook.com 143 My guess here is that 143 is unsecured, and 993 is over SSL. However, when I try to ...
1
vote
2answers
1k views

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 ...
0
votes
1answer
536 views

Amazon EC2 Ubuntu 16.04 telnet works on some ports and not for others

I am having a strange issue on my newly installed Amazon Ec2 ubuntu 16.04 LTS server. I have a server with ip (10.129.29.46) in a VPC which has the following ports open 80, 443, 11300 and 9000. Port ...
0
votes
0answers
152 views

SSH or telnet on other ports is not working from a specific network

We have an Lenovo server working well since one and a half year. Sudenly, we started having issues to connect to it from our office network. I reinstalled ubuntu 16.04 sever on it. It has two ethernet ...
0
votes
1answer
34 views

Exchange 2016 is ignoring a single host for SMTP/EWS

We've just completed a deployment and migration from Exchange 2010 to Exchange 2016. Our ticket system connects to an Exchange mailbox to generate tickets. Connections from the ticket system to ...
0
votes
1answer
850 views

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) ...
0
votes
2answers
930 views

Server remote MySQL connection not working after PHP upgrade from 5.4 to 5.6

MySQL remote connections used to work ok. Now it's not working anymore and we think it may be related to a PHP upgrade from 5.4 to 5.6. I did a script to test this connection: $db = @mysql_connect('...
0
votes
2answers
1k views

Local Server with external IP not reachable when in LAN

I have a local debain server with external IP and my own domain. But I got following problem: Using DNS/external IP from outside the LAN: Works Using local IP from inside the LAN: Works Using DNS/...
0
votes
2answers
795 views

How do I find out why port 8172 is blocked?

We have some web sites hosted with a third-party company, and wish to use web deploy. They have told us that we need to ensure that port 8172 is open, as that is needed. As a test, they gave us a URL ...
0
votes
1answer
122 views

Windows port will not open in google compute engine

I've added a firewall rule in GCE udp:5585;tcp:5585 in my networking config. I've also added an inbound rule in Windows to accept both udp and tcp connections on port 5585. I'm trying to set this up ...
0
votes
1answer
267 views

POP3 Server: ERR Unsupported authentication type

I've installed Axigen Mail Server and enabled SMTP and POP3 servers. After that, I've created domain (slava.local) and an user (slava). So now I can connect to the SMTP server (using telnet, open ...
0
votes
2answers
693 views

use multiple ip addresses to tcp check remote server's port

Im trying to tcp connect yahoo's mail server on port 25 . I have 3 public ip addresses lets say:- (all are allowed in SPF records) 99.99.99.99 77.77.77.77 88.88.88.88 How to telnet(or other checks) ...
1
vote
0answers
192 views

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 ...
2
votes
1answer
5k views

Sending an email with an attachment using telnet and ESMTP protocol [closed]

I would like to send an email using ESMTP protocol and attach a file to the email. I have no errors when sending regular email, I only have problem with attachments. Here's what I use for sending ...
1
vote
1answer
632 views

telnet to Yandex's smtp port wont work on Google Cloud Plaltform [closed]

I'm trying to send mail on my server which on located on vps in Google Cloud. I can telnet to gmail's SMTP both 587/465 but i can't connect via telnet to Yandex. It's stucking on Trying .... # ...
0
votes
1answer
113 views

Unable to connect VPS server hosted node js code to another provider MYSQL server

I have just bought the unmanaged VPS. I am running a node js application that uses a connection string for mysql database stored somewhere else. The connection between vps (nodejs web) and mysql ...

1
2 3 4 5
7