FTP session closed by remote host

[Gary Yu]

Hi,

I'm using a hpux 11.0 box, it's a heavy loaded developing environment. The problem is, some time(actually very often), when I ftp from my laptop to it, login is normal, but after I issued a command(ls, get,...) I got"connection closed by remote host", and at the same time, a "FTP session closed" is logged into the system log.

sometime, it works normal, I don't know why. could any expert help me?

[harry d brown jr · Accepted solution]

Could you be running out of processes (nproc)?

[Gary Yu]

Thanks Harry!

how can I check the current available 'nproc'

[harry d brown jr]

If you have glance you can check it there. I typically use the gui (gpm), but you can check it by going to the "System's Table Report". From "glance", enter a "t", which will also show you the system tables.

[Gary Yu]

I don't have a glance installed on this site :(
could I check it from command line or SAM or top?

Thanks!

[harry d brown jr]

Yes, sam in the kernel params area will tell you the current limit, but not the current number in use. You could try a trial version of glance, but I'm not sure of its capabilities. To count the approx. number of processes just do a "ps -ef|wc".

[James R. Ferguson]

Hi Gary:

Aside from using 'glance' to look at key table limits (like 'nproc'), you can use 'sar' to report the process, inode and file table sizes as defined on your system, along with their high-water mark and the number of times they have overflowed.

# sar -v 10 5

...will cause 5-samples to be taken, one every 10-seconds. See 'man sar' for more details.

...JRF...

[Gary Yu]

Thanks Harry, James

I checked it with 'sar -v', it seemed that the proc number is enough to use, my configuration of 'nproc' is 2420, and the output of sar -v for 'proc-sz' is 187/2420.

BTW, it seemed that the issue only happened between our laptop/PC and the HP box, not between hp-hp boxes.

Again, thanks for your prompt response!

[Anthony deRito]

Are you running ftpd with a timeout by any chance? Default is 15 minutes so this should not be a problem - just thought I would ask.

Tony