Im fairly new to Tmux but from what I've read, its using a client-server connection.
Why is that neccessary? Is that only for managing sessions? Why does it communicate through a socket rather than directly with the client?
If anyone could provide me an explanation, that would be appreciated.
Thanks.
Tmux requires a server that is able to keep located the processes when a session is detached.
If you run a process with the "nohup" or "disown" the process in going to run in background even when user logout, however the problem is to recover the control of the process when the user login again.
Tmux server keep those processes associated, so when you login and the user attach the session again. Tmux server is able to MUltipleX several Terminal sessions among other things.
All the magic of Tmux in made by the server, but you don't have to be afraid of Tmux server because, the Tmux server is not running as a general system daemon, the Tmux server is launched from the userspace individually, and when not user sessions are allocated Tmux server automatically stop itself, this is the reason why when you type "tmux ls" and sessions were not previously created the message "failed to connect to server: Connection refused" is displayed (The server is not running, hereby connection is refused).
Related
My college requires students to periodically authenticate for using WiFi and LAN. I am writing a Python script that will automatically do that so that I don't have to manually enter my credentials. The authentication is also separate for WiFi and LAN, and that makes me enter my credentials when I switch between them. So, for the python script, I want to detect when my authentication has expired and my connection is disconnected.
I also don't want the python script to be running constantly in the background and pinging a website as that really isn't optimal and I'll have to run the script every time my PC restarts. I was thinking of using the Windows Task Scheduler to fire the script when it detects that my connection is lost. The trigger event cannot be fixed intervals as the connection can be lost in between the intervals and also when switching between LAN and WiFi.
So, is there any network event that will capture the functionality I want? As Windows gives a notification of "opening the browser to connect" I feel there has to be a background event running.
I tried the NetworkProfile/Operational Event in the Task Scheduler with event id 10001 and 8003. But that just fires when I switch off the WiFi of my PC.
Thank you
Got it!
NetworkProfile/Operational Event with ID 4002 waits for network authentication.
I would like to know what happen to TCP connections when a windows user logs off and another user logs in on the same computer. Will the tcp connections created by user 1 be closed or it will be yet open in the background.
Thanks
Connections depend on processes. Usually when logging off, user-initiated processes and their TCP connections are closed.
You can keep processes and connections open by switching users instead of logging off and on again.
I implemented an SSH server using libssh 5.5.
Running a single ssh client connecting to the server on port 22, all works fine.
The problem arises when I try to connect a second client (I use PUTTY ssh terminal as clients). The server thread waiting for a client connection in ssh_bind_accept is not activated, and the newly opened (second) terminal is obviously 'dead' (the first open
terminal works correctly).
I wonder if there is something important to set that I'm missing.
Here are the calls i perform:
1. Create the session:
sshbind = ssh_bind_new();
session = ssh_new();
2. Call the listen:
ssh_bind_listen(sshbind)
3. Call the accept:
ssh_bind_accept( sshbind, session )
4. Open a putty terminal, which unlocks the *ssh_bind_accept* at step 3
5. Create a new thread and continue terminal dialogue in newly created thread
Basically, the server I developed is based on the sample here: How to use libssh as server?
Having to support multiple client terminals, I have a listener,
and when a connection is created (return from ssh_bind_accept), I create a new thread and continue the ssh connection there. After forking, I create new bind and session, and put myself waiting in ssh_bind accept.
The problem is that opening a second terminal, doesn't cause the ssh_bind_accept to return.
Did you try to do a ssh_bind_free(sshbind) in the child process after having forked ? It is possible that having the listener file descriptor in multiple processes at same time causes problem.
Aris
I'm getting this error when using Putty:
Server unexpectedly closed network connection
I think there is a problem with the network in my office because all computers at my work workplace have the same problem. How can I fix this?
If this error happens after a while that you are connected to the host, probably in your work network have some router periodically closing the connections, a workaround for this is keep your terminal busy, running something like top when you are away, but remember this creates a security breach.
Basically your connection is being closed by inactivity, if you just keep something running in your terminal, is more likely that it doesn't close the connection, I mean by something running as the terminal screen being refreshed constantly, if you run a Linux box, type the command top, that shows the box load and refreshes every 5 seconds.
I'm the part time FTP server administrator (with no real full-time admin). We currently only allow ACTV mode connections. Some of our clients have had issues with this but for the most part they've been ok using ACTV. For the few who aren't, we've been able to push the data over to their servers from ours.
there is one client in particular however who is currently having trouble. He is using file-zilla and issuing a PORT command.
First, does using the PORT command imply that you are in ACTV mode?
Second is there a way in FileZilla to explicitly change to ACTV mode?
Thanks for the help,
_Ramy
Active mode requires the PORT command. PORT is what tells the server where to connect to on the client in order to open the data channel.
Active FTP breaks when the client is behind NAT, hence Passive is the preferred default in most situations where FTP is used. It is strongly preferable to not use FTP and switch to SFTP.