Occasionally, your system may issue an error code indicating a malfunctioning inactive sealant. There are several reasons that can cause this problem. This error means that the network connection that PuTTY was trying to establish with your server was rejected by the server. This usually happens due to the server not providing the service that PuTTY is trying to access.
Troubleshoot PuTTY network error
The program terminated the connection
Read what PuTTY said about the error
This is a common error caused by Windows networking code when an established connection is lost for some reason. For example, this can happen when you unplug a network cable from the back of an Ethernet-connected computer, or when Windows has a similar reason to believe that the entire network is no longer available.
Windows will also throw this error when it stops responding to the computer on the other end of the connection. If the network between your client and server goes down and your client tries to send data, Windows will make several attempts to send data, and then terminate and close the connection. This can especially happen if you didn’t enter anything while using SSH-2 and PuTTY tries to exchange the key again.
(This can also happen if you are using keepalive packets for your connection. Other people have reported that keepalive packets fix this bug for them. (There are pros and cons for keepalive messages .))
We do not know of any reason why this error could have occurred, which could be a bug in PuTTY. The problem is between you, your Windows system, your network and the remote system.
Try another SSH client
The problem is probably somewhere between PuTTY and the target SSH server. Use another SSH client like (http://kitty.9bis.net) to prove it and see if the problem still occurs here. This will most likely isolate the PuTTY issue.
Suspicious irregular internet connection
The problem may be an unstable internet connection. Internet Connection Monitoring Internet connection availability is a good way to determine if your ISP is losing packets and is responsible for the PuTTY crash. Get software that checks for an Internet connection. Example: http://code.google.com/p/internetconnectivitymonitor/. Frequent and prolonged disconnections from the Internet violate the requirements for the provider’s services. In this case, it is difficult to prove that the ISP is to blame, because the technical support serviceIt automatically tracks these types of problems on your computer, operating system, router, and wiring to your home. If you use wired internet and live in the suburbs, faulty equipment in your neighbors’ homes can send static electricity down the line for a few seconds / minutes when first turned on. Finally, it is possible that you have faulty equipment on the ISP’s network at home. The cost of replacing equipment for ISPs is so high that they often do not do it if there are not enough subscribers in the area to justify the costs.
Intended Wired / Wireless Router
Are you connecting via a wired / wireless router? How old is he? Your router might be the problem. Old wireless and wired technologies can become obsolete and disconnect and restart connections from time to time, leading to the death of PuTTY. Take these components out of the equation and see if that solves the problem. Try using a wired connection and / or a different route The installer to see if this solves the problem. I had a Linksys WiFi router suffering this slow death, disconnecting and rebooting.
Suspected of operating system providing SSH connection
The computer you are connecting to using SSH has a policy of seconds to keep SSH connections open. This number is set low for security reasons and can be increased. The location of this parameter depends on the operating system you are using that supports SSH.
If you are using PuTTY through a virtual machine
If you are running PuTTY under a virtual machine, the virtual machine may have a policy that interrupts your SSH connection to the server if it thinks it is down. The increase in these values depends on the software and operating system of the virtual machine you are using.
If your internet connection is bad, you can bypass the SSH client connection:
If your ISP provides an unstable connection, you can useUse ssh autologin to make disconnecting less painful. They generate a public key and a private key. And you tell your overseas server to automatically admit anyone who provides the exact private key. This doesn’t completely solve your problem, but when the internet goes down, just close the window, double-click the icon and you will immediately be taken back to your home folder command prompt without typing your username / word. Password.
This will help you:Is there a way to automatically log into PuTTY with a password?
What Are The Possible Causes Of The PuTTY Fatal Error And How To Fix Them?
We have seen many reasons for SSH connection denied in PuTTY.
Today ‘hi We will discuss three main reasons in detail.
- IP address not included in firewall
- DNS propagation delay
- Blacklisted IP Address
Read on to find out more about these causes and how to fix them.
Fix 3: Check If Your Domain Records Point To The Server
If you are working with a new server and a new domain, the error may occur due to the wrong DNS server address in the domain settings. With an entire domain registrar, you can direct your domain to a third party hosting provider through a nameserver.
If you installed only one server and did not change the name server, you may encounter a network error: connection failure.
To resolve this issue, log into your domain name provider and check your nameserver settings to see if the nameservers point to your hosting provider.
Fix 4. Check The Server For Blacklisted And Whitelisted IP Addresses
For security reasons, the system administrator can only allow connections from computers with a known IP address that are already whitelisted in the configuration file.
If your ISP’s IP address has changed or you are new to this job, you will probably need to ask your network administrator for an exception.
The same can happen if your IP address is accidentally blacklisted by an administrator The network initiator.
Check with your network administrator for both scenarios and see if they can help you fix the problem.
Fix 5: Disable Firewall
If you are using Windows, your standard Windows antivirus or security firewall and firewall may block incoming connections, resulting in a connection denied error.
Try temporarily disabling your firewall to see if this “Connection refused” error resolves. In this case, you may need to change your firewall settings to completely resolve the error.
Disable Windows Security Firewall
Disable antivirus firewall
If a third-party antivirus is running, you may also need to disable the firewall offered by the application. You can turn off the firewall using the Antivirus Settings option.
Now try connecting to PuTTy. Once the connection is established, you will need to change your firewall settings to fix this issue.
Your network must be protectedena! Check out our 15 best firewalls to protect your home network.
If none of the fixes worked for you, you can try restarting the SSH server or restarting the servers.
If your server was configured by someone else, it is likely that they arbitrarily moved the default port. Contact and ask configuration nodes to get a better understanding of the ports.
If you are using a fully managed server please contact support. If the problem is related to the termination of the hosting provider, the system administrator will fix the problem.
Finally, you can use other alternatives to putty, for example: B. other SH terminals. This can help you if you run into a PuTTY specific error.