![]() The value is measured in seconds so, for example, if your firewall cuts connections off after ten minutes then you might want to enter 300 seconds (5 minutes) in the box. If you find your firewall is cutting idle connections off, you can try entering a non-zero value in this field. The keepalive option (‘Seconds between keepalives’) allows you to configure PuTTY to send data through the session at regular intervals, in a way that does not disrupt the actual terminal session. This can cause PuTTY sessions to be unexpectedly closed by the firewall if no traffic is seen in the session for some time. Usually, these firewalls will assume a connection is dead if no data is transferred in either direction after a certain time interval. Some network routers and firewalls need to keep track of all connections through them. How keepalives to prevent disconnection with Putty: 300 seconds may be better if network outages are your problem, read below for details. On the section that says "Sending of null packets to keep session active", Changed it to 5 seconds.Load your connection settings if you have them saved.Putty has a feature which attempts to fix this problem: Network Error: Software caused connection abort Window's current smartphone-based Zune-OS for Desktop has broken Putty at the network level, in pursuit of irritating away all points of entry or exit that are not part of the pay-for-play Azure Vendor tool stack. I wrote this answer 9 years ago for Windows XP, Putty software is 21 years old and so this answer is useful for historical purposes. Windows XP or prior Operating system only: When I failed to log in, ping failed too! But, how can that happen? I use VMware player to host the Linux server on my local machine! One thing I have to mention is that when I'm using PuTTY SSH connecting to a remote server, and it's all OK! It seems sometimes I can log in, but sometimes login times out! I really don't know why. I turned off both the Linux server firewall and Windows 7 client firewall, but login still times out! It is really annoying! Set the PuTTY connection setting 'seconds between keepalives' to 5.īut these all don't work! And the SSH session in PuTTY still breaks after sometime!.Set sshd ClientAliveInterval to 900 and ClientAliveCountMax to 3.I did a Google search and applied all methods to help, including: What could be the reason for this problem and how can it be fixed? Supplement: However, I also guess Windows 7 has some quirk because the same Ubuntu server hosted in VMware as a code repository works very well when on Windows Vista! It seems all the bad things happen after I moved from Windows XP to Windows Vista and then Windows 7! I guess there's something wrong with my VMware Player, because I have another Ubuntu desktop hosted in VMware as a code repository server, and it more often than not has a timeout error when I do an SVN update/commit. And sometimes I even can't login, getting an error saying timeout. Usually I can login in the server with PuTTY and do something, but after a random time (about one or two minutes) I get that error. 00:00:02.251004 E1000#1: Chip=82540EM LinkUpDelay=3000ms EthernetCRC=on GSO=enabled Itr=disabled ItrRx=enabled TID=disabled R0=enabled GC=enabledĠ0:00:02.251127 IntNet#0: szNetwork= fFlags=0x8000 cbRecv=325632 cbSend=196608 fIgnoreConnectFailure=falseĠ0:00:02.251193 VMSetError: F:\tinderbox\win-6.0\src\VBox\Devices\Network\DrvIntNet.cpp(1768) int _cdecl drvR3IntNetConstruct(struct PDMDRVINS *,struct CFGMNODE *,unsigned int) rc=VERR_INTNET_FLT_IF_NOT_FOUNDĠ0:00:02.251217 VMSetError: Failed to open/create the internal network 'HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter'Ġ0:00:02.251250 VMSetError: F:\tinderbox\win-6.0\src\VBox\Devices\Network\DevE1000.cpp(7986) int _cdecl e1kR3Construct(struct PDMDEVINS *,int,struct CFGMNODE *) rc=VERR_INTNET_FLT_IF_NOT_FOUNDĠ0:00:02.251252 VMSetError: Failed to attach the network LUNĠ0:00:02.251262 PDM: Failed to construct 'e1000'/1! VERR_INTNET_FLT_IF_NOT_FOUND (-3600) - The networking interface to filter was not found.Ġ0:00:02.I have a strange problem: When I'm using PuTTY with SSH connecting to a Linux server hosted in VMware on my local Windows 7, I often get the error saying "Network error: Software caused connection abort" and then the PuTTY SSH window is inactive.
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