Error:
System.IO.IOException: Unable to read data from the transport connection: An established connection was aborted by the software in your host machine. ---> System.Net.Sockets.SocketException: An established connection was aborted by the software in your host machine
at System.Net.Sockets.NetworkStream.Read(Byte[] buffer, Int32 offset, Int32 size)
I have a connection that works, works, works ... and then error.
Then works, works and then error ..
Can't find any pattern... the mails retrieved are small so it can't be a resurce problem.
I have a nother that alwayes work..
I use port: 993 and SSL
Where do I look to solve the problem ??
Unable to read data from the transport connection: An established connection was aborted by the software in your host machine.
This is a generic Windows socket error that simply means that the connection between the client and the remote host was disconnected for some reason.
This could be caused by any number of reasons, such as (but not limited to):
The remote host was rebooted
The remote host lost power (electricity went out)
The IMAP/POP3/SMTP server software crashed
The IMAP/POP3/SMTP server software disconnected your client because it was idle for too long
A router between the client and the server was restarted
A network cable was unplugged or (accidentally) cut somewhere between the client and server
on and on the list goes...
You are just experiencing the joys of network programming. Network connections are not 100% reliable as they can be dropped at random times for all manner of reasons.
All you can do as a programmer is catch these exceptions and attempt to reconnect and make the same request again.
That's all you can do.
Related
I am entering the ip of the machine I wanted to connect using vnc viewer but it's giving me this error:
So, that error means
No response was received from the specified IP address, even to reject
the connection.
Ways to fix this:
Check the remote computer is switched on. Ensure antivirus software lists VNC Server as an exception, and the firewall is configured to allow access on VNC Server’s listening port (5900 by default).
See if you are attempting to establish a direct connection over the Internet.
You can check any vnc error message from https://help.realvnc.com/hc/en-us/articles/360002254738-VNC-Connect-Error-Messages
I installed postgreSQL server on a raspberry pi 4 with raspbian buster. When I try to connect from local network i have no problems about idle time. When i try to connect from my static public ip I can send command but if I didn't send anything for more than 3 minutes, it appears this message "Connection to the server has been lost".
I tried to install ufw and disable it, I used DMZ, I tried to change keepalive_idle, but i have always the same problem. Please help me.
sometimes the error is
"ERROR: SSL SYSCALL error: Operation timed out"
(Note: always if I am connected from public IP)
If you don't have the same issue from within your local network I assume the connection is being terminated by a network device sitting between the client and the server (a router most likely).
There are routers with small TCP timeout settings (such as 300 seconds) which is close to what you're experiencing.
Try to check (and increase if needed) the TCP timeout settings on your router (and any other devices you might have in between).
Edit:
I tried to find some info on that device (seems to be Sercomm VD625) and it does not seem you can easily change TCP timeout settings (maybe via telnet/ssh if it supports it).
However, a simpler solution might be to avoid keeping an open connection to PostgreSQL if you will have large idle intervals; just connect when you need to and close the connection afterwards.
I have a Java Socket Server running on a Windows Server 2008.
When using a multi-threads client to send several TCP connections at the same time, the client always get the "Errno 111 connection refused" error after the establishment of the first connection.
Here's the capture trace of Wireshark (10.1.3.136 is the server, 10.34.10.132 is the client): Trace and the specific red trace goes here:Trace2
So, what's the issue?
If I delay-launch the thread by more than 5ms, or use a centos as the server, the errors disapperar. No exceptions are found in the server trace file.
The issue is that you have filled the backlog queue, whereupon Windows starts issuing resets to further incoming connection requests.
This could be because you specified a small backlog value, but the more likely cause is that your server is simply not accepting connections fast enough: your accept loop is fiddling around doing other things, such as DNS calls or even I/O with the client, all of which should be done in the client's thread. All the accept loop should do is accept sockets and start threads.
I establish a TCP connection between my server and client which runs on the same host. We gather and read from the server or say source in our case continuously.
We read data on say 3 different ports.
Once the source stops publishing data or gets restarted , the server/source is not able to publish data again on the same port saying port is already bind. The reason given is that client still has established connection on those ports.
I wanted to know what could be the probable reasons of this ? Can there be issue since client is already listening on these ports and trying to reconnect again and again because we try this reconnection mechanism. I am more looking for reason on source side as the same code in client sides when source and client are on different host and not the same host works perfectly fine for us.
Edit:-
I found this while going through various article .
On the question of using SO_LINGER to send a RST on close to avoid the TIME_WAIT state: I've been having some problems with router access servers (names withheld to protect the guilty) that have problems dealing with back-to-back connections on a modem dedicated to a specific channel. What they do is let go of the connection, accept another call, attempt to connect to a well-known socket on a host, and the host refuses the connection because there is a connection in TIME_WAIT state involving the well-known socket. (Stevens' book TCP Illustrated, Vol 1 discusses this problem in more detail.) In order to avoid the connection-refused problem, I've had to install an option to do reset-on-close in the server when the server initiates the disconnection.
Link to source:- http://developerweb.net/viewtopic.php?id=2941
I guess i am facing the same problem: 'attempt to connect to a well-known socket on a host, and the host refuses the connection'. Probable fix mention is 'option to do reset-on-close in the server when the server initiates the disconnection'. Now how do I do that ?
Set the SO_REUSEADDR option on the server socket before you bind it and call listen().
EDIT The suggestion to fiddle around with SO_LINGER option is worthless and dangerous to your data in flight. Just use SO_RESUSEADDR.
You need to close the socket bound to that port before you restart/shutdown the server!
http://www.gnu.org/software/libc/manual/html_node/Closing-a-Socket.html
Also, there's a timeout time, which I think is 4 minutes, so if you created a TCP socket and close it, you may still have to wait 4 minutes until it closes.
You can use netstat to see all the bound ports on your system. If you shut down your server, or close your server after forking on connect, you may have zombie processes which are bound to certain ports that do not close and remain active, and thus, you can't rebind to the same port. Show some code.
What is the meaning of the "connection reset by peer" error on a TCP connection? Is it a fatal error or just a notification or related to the network failure?
It's fatal. The remote server has sent you a RST packet, which indicates an immediate dropping of the connection, rather than the usual handshake. This bypasses the normal half-closed state transition. I like this description:
"Connection reset by peer" is the TCP/IP equivalent of slamming the phone back on the hook. It's more polite than merely not replying, leaving one hanging. But it's not the FIN-ACK expected of the truly polite TCP/IP converseur.
This means that a TCP RST was received and the connection is now closed. This occurs when a packet is sent from your end of the connection but the other end does not recognize the connection; it will send back a packet with the RST bit set in order to forcibly close the connection.
This can happen if the other side crashes and then comes back up or if it calls close() on the socket while there is data from you in transit, and is an indication to you that some of the data that you previously sent may not have been received.
It is up to you whether that is an error; if the information you were sending was only for the benefit of the remote client then it may not matter that any final data may have been lost. However you should close the socket and free up any other resources associated with the connection.
one of the reasons for seeing this error and having trouble connecting to the server is that you enabled the firewall in the UNIX machine and forgot to add a rule to accept ssh connection. search in your WPS provider and you will find a way to connect to you machine and add this rules:
ufw allow ssh && ufw allow 22