I'm trying to copy a file from one of my local machines to a remote machine. Copying a file with size upto 1405 bytes works fine. When I try to scp a larger file, the file gets copied but the scp process hangs up and doesn't exit. I have to hit Ctrl-C to return back to the shell. I …
The reason for scp to stall, is because scp greedily grabs as much bandwith of the network as possible when it transfers files, any delay caused by the network switch of the firewall can easily make the TCP connection stalled. We had similar spurios problems with scp to some Linux servers (Debian, 2.6.24-etchnhalf). We were able to do away with the stalls by disabling the TCP variable tcp_sack ("tcp selective acknowledgements") on the remote servers: sysctl -w net.ipv4.tcp_sack=0 On Debian, tcp_sack is enabled by default. This solves the SCP stalling issue I had with copying files to a CentOS 6.4 VM. Transfers would stall at the same 2112 KB point. – davidjb Mar 18 '14 at 5:50 Here it is 2014, running latest Debian, fresh install and this is still a problem on my PC? Since scp greedyly grabs as much bandwidth of the network as possible when it transfers files, any delay caused by the network switch or the SuSE firewall can easily make the TCP connection stalled. For this reason, the solution is to limit the bandwidth quota for scp as below:
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I have read documentation on SCP and just trying to figure out how go about doing this - below are two pieces of code, one is SFTP and one is SCP. My goal is to have this done via password-less authentication, fully automated. Currently we use SFTP and the …
Is the scp stalling at the same point every time? (specifically 2112) You may have an issue with your MTU and the switch hardware/config you are using. Stack Overflow had a post on this topic http://stackoverflow.com/questions/11985008/sending-a-large-file-with-scp-to-a-certain-server-stalls-at-exactly-2112-kb aj Community Member 32 points
Re: scp / sftp / even FTP stalled between hpux. Apparently the size parameter of the HP-UX ping means "ICMP payload size": the total packet size is (payload size + IP header size), which in this case was 1520 bytes. scp sends ok but stalls on receiving. I have set up a server using Suse, which I have done several times. This one is running 11.2 'Emerald'. It has 2 network cards. One is connected to a bt router with a static ip, and the other is for the internal network. The server is used as the gateway for the internet via masquerading. When I do a SCP transfer through a SRX 240 firewall, the transfer stalls [0% 4844KB 2.8MB/s - stalled] and the "Send-Q" is full on transmitting host(TCP Window Full). I have tried this through two different SRX240 clusters with different servers (nix). None of the switch interfaces (EX4200), Shortly after, SCP-079 starts a site-wide containment failure, causing several Euclid and Keter SCPs to breach containment. scp to remote servers stalls, unable to isolate cause. you die, i die, he dies, she dies, ze dies, they die, the one on the roof dies, the birds singing die, the plants die, the one who put ketchup packets on the toilet