Sluggish FTP and SSH

Dogcow · 02-06-2002, 03:46 AM

FTP and SSH take a while to respond when connecting. FTP takes a long time before responding at all, while ssh takes a long time to process user passwords. What would make this so slow? Any suggestions on speeding them up?

Thanks

rudy_venice · 08-17-2004, 04:26 PM

Quote:

Originally Posted by Dogcow


	FTP and SSH take a while to respond when connecting. FTP takes a long time before responding at all, while ssh takes a long time to process user passwords. What would make this so slow? Any suggestions on speeding them up? Thanks

I had the same problem here with a 733mhz single cpu G4 with 1 gb RAM. I upgraded the processor and added some RAM and it improved a huge amount. We use ours for ftp, webserver and mailserver so it was busy. I'd be interested in what you find is the problem in the end.

yellow · 08-17-2004, 04:35 PM

Quote:

Originally Posted by Dogcow


	FTP and SSH take a while to respond when connecting.

Outbound or inbound? Mac specs? OS version?

ceph · 03-01-2005, 01:10 PM

Quote:

Originally Posted by yellow


	Outbound or inbound? Mac specs? OS version?

i have the same problem with a 1.8ghz imac, 768 mb ram, brand new machine.
i use a router/firewall, software firewall and NIDS, but have disabled all of it and it hasn't helped.

all inbound to the computer ssh and ftp is running on. ftp is ridiculously slow, half the time the connection dies, and ssh gives me a login prompt quickly, but takes a very long time (a couple of minutes at least) to prompt for the password.

i hope someone can help figure this problem out because it makes remote access to my machine unbearable. =/

-- the only difference is that i'm actually using Mac OS X, not Server.

hayne · 03-01-2005, 01:33 PM

Look for a post on these forums not so long ago about slow ssh connections. If I recall correctly, the solution there was to disable IPV6 since the slowness was caused by failing IPV6 reverse name lookups or something.

ceph · 03-01-2005, 01:53 PM

ok, i'll try that, thanks.

apologies for the cross post. i was just trying to keep to the topic. =)

ceph · 03-01-2005, 02:10 PM

well, for one i'm not running bind. i've disabled all IPV6

(ceph@cephnet:~) $ ip6config stop-v6 all
Stopping IPv6 on all interfaces.
ip6: error detaching en0
ip6: error detaching fw0

tried as sudo, still get those last two errors, and nothing changes in regards to ssh and ftp time.

do the en0 and fw0 interfaces need to be inactive for it to work?

thanks.

hayne · 03-01-2005, 02:52 PM

Use the Network preferences GUI for disabling IPv6 - via the "Configure IPv6" button under the TCP/IP pane.

ceph · 03-02-2005, 08:10 AM

i used the preference panel to turn off IPv6, and it looks like it drastically reduced the time it takes for ftp or ssh to respond. It's not 100% though, as it still takes about 15 seconds for ftp to kick through (could be anything though, likely the router), but it's a whole lot better than it was.

thanks again for the help.

voldenuit · 03-02-2005, 10:21 PM

For the 15 seconds issue this recent hint should help:

http://www.macosxhints.com/article.p...18462#comments

ceph · 03-04-2005, 07:52 AM

Quote:

Originally Posted by voldenuit


	For the 15 seconds issue this recent hint should help: http://www.macosxhints.com/article.p...18462#comments

thanks.. i'm just not sure bellsouth cares or will do anything about this. (i get the NXDOMAIN deal, so ssh will still be a little slow unless i can find a way to fix that too.)

i appreciate the help

KRaven0825 · 03-04-2005, 08:29 AM

Just something I noticed with my ftp and ssh from outside my network. First if you are trying to ftp or ssh into a machine that is on an airport connection make sure interference robustness is off, it might be coincidence but it cut my wait time in half....I have virtually no delay in ftp, telnet, or ssh, and my laptop is running on a airport express that is boosting my signal from my airport extreme that is across the house.

Another thing if it is your internet provider....try changing the MTU with your ifconfig for en0 or en1(depending if you are using wireless or not)....i know DSL is picky about the MTU being 1492 (i believe) for optimum performance....my MTU is 1500 but I am on T1, so it may vary...also this MTU defaults back to 1500 with a reboot, so if you change it it will change back.
The command is below to change it.

As root:
ifconfig en1 mtu 1492

you can change that number to whatever, but i am no expert, i just read this off of other boards a while back and remembered it.

02-06-2002, 03:46 AM	#1
Dogcow Triple-A Player Join Date: Jan 2002 Posts: 131	Sluggish FTP and SSH FTP and SSH take a while to respond when connecting. FTP takes a long time before responding at all, while ssh takes a long time to process user passwords. What would make this so slow? Any suggestions on speeding them up? Thanks

Thread Tools
Show Printable Version Email this Page
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:

03-01-2005, 01:33 PM	#5
hayne Site Admin Join Date: Jan 2002 Location: Montreal Posts: 31,941	Look for a post on these forums not so long ago about slow ssh connections. If I recall correctly, the solution there was to disable IPV6 since the slowness was caused by failing IPV6 reverse name lookups or something.

03-01-2005, 01:53 PM	#6
ceph Prospect Join Date: Mar 2005 Posts: 7	ok, i'll try that, thanks. apologies for the cross post. i was just trying to keep to the topic. =)

03-01-2005, 02:10 PM	#7
ceph Prospect Join Date: Mar 2005 Posts: 7	well, for one i'm not running bind. i've disabled all IPV6 (ceph@cephnet:~) $ ip6config stop-v6 all Stopping IPv6 on all interfaces. ip6: error detaching en0 ip6: error detaching fw0 tried as sudo, still get those last two errors, and nothing changes in regards to ssh and ftp time. do the en0 and fw0 interfaces need to be inactive for it to work? thanks.

03-01-2005, 02:52 PM	#8
hayne Site Admin Join Date: Jan 2002 Location: Montreal Posts: 31,941	Use the Network preferences GUI for disabling IPv6 - via the "Configure IPv6" button under the TCP/IP pane.

03-02-2005, 08:10 AM	#9
ceph Prospect Join Date: Mar 2005 Posts: 7	i used the preference panel to turn off IPv6, and it looks like it drastically reduced the time it takes for ftp or ssh to respond. It's not 100% though, as it still takes about 15 seconds for ftp to kick through (could be anything though, likely the router), but it's a whole lot better than it was. thanks again for the help.

03-02-2005, 10:21 PM	#10
voldenuit Hall of Famer Join Date: Sep 2003 Location: Old Europe Posts: 4,969	For the 15 seconds issue this recent hint should help: http://www.macosxhints.com/article.p...18462#comments

03-04-2005, 08:29 AM	#12
KRaven0825 Triple-A Player Join Date: Feb 2005 Location: Mass. Posts: 100	Just something I noticed with my ftp and ssh from outside my network. First if you are trying to ftp or ssh into a machine that is on an airport connection make sure interference robustness is off, it might be coincidence but it cut my wait time in half....I have virtually no delay in ftp, telnet, or ssh, and my laptop is running on a airport express that is boosting my signal from my airport extreme that is across the house. Another thing if it is your internet provider....try changing the MTU with your ifconfig for en0 or en1(depending if you are using wireless or not)....i know DSL is picky about the MTU being 1492 (i believe) for optimum performance....my MTU is 1500 but I am on T1, so it may vary...also this MTU defaults back to 1500 with a reboot, so if you change it it will change back. The command is below to change it. As root: ifconfig en1 mtu 1492 you can change that number to whatever, but i am no expert, i just read this off of other boards a while back and remembered it.