I'm trying to write a Python IRC script. It is not connecting to my UnrealIRCD server, so I tried it with TELNET:
telnet xx.xx.xx.xx 6667
Trying xx.xx.xx.xx...
Connected to xx.xx.xx.xx.
Escape character is '^]'.
PASS MYSERVERPASS
NICK MYNICKNAME
PING :7EF7F35D
USER MyUserName 8 * :MY REALNAME
After this connection, it doesn't accept the registration and times out. When I try to connect via telnet to an EFnet server, for instance, this process works fine.
So, does anyone have an idea what is wrong with the registration process?
Other clients and Eggdrop Bots can connect to the server with no problem. So I don't understand why these simple protocol commands are not working.
I assume this message was sent by the server:
PING :7EF7F35D
You have to reply to it, with this message:
PONG :7EF7F35D
(change the payload of the PONG to match the one in the PING)
This is probably required by the server to avoid attacks.
Related
I configured Gitea to authenticate against an AD server, and I'm receiving the following error:
[...dels/login_source.go:390 LoginViaLDAP()] [E] LDAP Connect error, my.ad.server.address.here:LDAP Result Code 200 "Network Error": read tcp <gitea host ip>:37590-><ad server ip>:389: read: connection reset by peer
What is strange to me is that the number 37590 in the example above always changes at each occurrence. Is it a port number? If true, how can I track it so I can whitelist it at the AD server firewall?
I'm a newbie in Go, so I can't figure out what's happening.
The 37590 that you see is the source port. It is the port that the server will use when replying and helps your computer know which application the response is for. It's normal for that to change on each request.
You are correct in thinking that this is a network problem. The error message "connection reset by peer" means that someone along the line (either a firewall along the path, or the host itself) closed the connection. (a little more detail here)
If it is a firewall that is not allowing you, then you need a rule allowing access from gitea host ip:any to ad server ip:389.
I made a Node js tcp server to listen on port 5000 using net
_createServer(){
var self = this;
net.createServer(function(socket){
self._attachDefaultHandlers(socket);
}).listen(this.settings.port);
return this;
}
Whenever I create a telnet client
telnet localhost 5000
I connect to the server. The problem is every time i type, data is sent. Why does telnet not wait for me to press enter?
This is how windows shell responses to Telnet protocol by design. In order to achieve what you want, you can try Putty, a third party terminal simulator, it does a far better job than CMD in communicating through SSH/Telnet.
Im trying to download a file from a FTP server using active mode.However,it looks like my connection just"expire" or something each time.First,I open a port on my computer using netcat,ex:
nc -vv -l -p 62077
this will listen on port 62077 on my computer.Then,I open another netcat windows,log in to the FTP link using port 21,and once im in the directory where the file I want is in,I do
PORT (my IP separated by , ),(242,125(wich equals to port 62077)\r\n
However,after I enter this command,nothing happen for about 10-15 seconds,and the netcat just quit without saying anything.Nothing happen either on the netcat window that is listening on port 62077.It does that everytime,I dont know what I am doing wrong.I did the same thing with Filezilla(in active mode) and examinated the commands with wireshark,I do the exact same command as Filezilla,however filezilla will be able to retrieve the file while netcat wont.I want to retrieve it with netcat and I dont know what im doing wrong.I am using Windows 10.
thank you!
After you have established your listening nc socket, and after you have sent the USER, PASS, and PORT commands, you then need to trigger the file transfer to that listening socket using e.g.:
RETR /path/to/file/to/download
on the control connection. (Unless you actually are already doing this, but didn't mention it in the post?)
Also, just to note: you mention using something like this:
PORT 1,2,3,4,(242,125)\r\n
Right? Those parentheses might also be an issue. Instead, you might try:
PORT 1,2,3,4,242,125\r\n
without any parentheses.
Now, depending on the IP address you sent (hopefully not a private network address), the data transfer may still not happen, due to firewalls/routers/NAT on the client side of things. Given that your Filezilla download of the same file works, I suspect that those firewall/router/NAT issues may not apply.
Hope this helps!
I have googled and searched all over but I am still having trouble getting connected to a site using the ftpzilla
I am getting this read out when I try to connect to the server using the network connection wizard
Connecting to probe.filezilla-project.org
Response: 220 FZ router and firewall tester ready
USER FileZilla
Response: 331 Give any password.
PASS 3.9.0.6
Response: 230 logged on.
Checking for correct external IP address
Retrieving external IP address from
http://ip.filezilla-project.org/ip.php
Checking for correct external IP address IP 173.56.114.112
bhd-fg-bbe-bbc
Response: 200 OK
PREP 60010
Response: 200 Using port 60010, data token 1063172065
PORT 173,56,114,112,234,106
Response: 200 PORT command successful
LIST
Response: 150 opening data connection
Response: 503 Failure of data connection.
Server sent unexpected reply.
Connection closed
The weird thing is I only get this error for this particular server and the server I use for my personal site (namecheap.com) gives me no such error. Does anyone know why this may be happening? And please try not to point me to the network configuration wiki because I have read through that and I still am at this point.
PORT 173,56,114,112,234,106
....
Response: 503 Failure of data connection.
...
please try not to point me to the network configuration wiki
You are using active mode, that is the ftp client (FileZilla) waits for a connection from the server. Obviously the server can not connect to the client which indicates that something like a firewall restricts the connection.
Since according to your description this happens only with few servers, you either use only these servers with active mode or these servers are protected by firewalls which do not allow active mode. Have you tried with passive mode?
I had a similar issue connecting and made the following changes and had success.
Go to File>>>Site Manager>>>
For my site, I changed the Encryption to "Only use plain FTP(insecure)" and had success. May you find the same success.
I've been trying to get sqlplus to connect to Oracle from my OS X machine. I asked another question about it here.
One person suggested that I try telnet. Consulting the man page, I tried:
[ ethan#gir ~ ]$ telnet DBHOST:1521
Trying xxx.xxx.xxx.xxx...
telnet: connect to address xxx.xxx.xxx.xxx: Operation timed out
telnet: Unable to connect to remote host
Also...
[ ethan#gir ~ ]$ telnet DBHOST 1521
...with same result.
I'm not sure how to interpret these results. Seems like what you'd expect in any case. You wouldn't do this...
$ ssh some_mysql_host:3306
How is telnet to Oracle different?
Or maybe I didn't understand what they meant.
If anyone could help me understand how one uses telnet to test a connection to Oracle I would be grateful.
They're proposing use of telnet simply because it's one of the simplest TCP/IP clients and because it's installed almost everywhere. It's just an easy way to check from the command line whether you're actually able to make a TCP/IP connection to any particular service.
Also, on many of the ASCII based IP protocols it's straight forward to actually interact with the server to check its working by typing in commands and looking at the responses - I've done this numerous times myself with SMTP servers.
In your case, as you're getting a timeout, either the whole host is down, or the access to that particular host or service is being blocked by a firewall. If you can reach the server with a ping then the latter is more likely.
There's also an outside chance that your name resolution is actually taking you to the wrong host, but you should be able to confirm that by looking at the IP address that telnet said it was trying to connect to.
Another common response is "connection refused". That means that the host is up, but that there's no service running on the specified port.
Basically when you specify a port number e.g
Telnet myserver 1521
It will try to connect to the machine on that port. If you see any data returned or even a blank console then it has connected. If you receive an unable to connect message then the machine is not listening on that port or a firewall is blocking the connection.
Your attempt to telnet to dbhost 1521 getting 'unable to connect' with a timeout suggests that either your hostname resolution for 'dbhost' is giving you the wrong answer, or that host is offline, down or you have network problems.
If oracle was working, you'd get a connection. You wouldn't really be able to do anything with it, but it would confirm that oracle was up and listening.
Oracle instance is not connected from other systems, while it is connected from localhost, I think port is not opened and it is showing problem to telnet 1521 port from other system.
Why not do it the 'right' way? Telnetting to some arbitrary network port will not give you correct information, if the database and it's listener is working correctly.
Just install the oracle instantclient software and use the configuration wizard.