ftp problem on 11.11

[Marty Hoff]

I have two 11.11 machines. They have the same patches, from what I can tell. However, on one machine I cannot use FTP. I can establish the command connection, but once I login I can't transfer files or even do an ls. I get the following error:

ftp> ls
ftp: setsockopt (SO_RCVBUF): Invalid argument

I'm mystified as to what the differences are between the systems. We are running with the June 2003 quality pack of patches.

thanks for any help.

Marty

[Mark Grant]

This seems to be an attempt to set the maximum datagram size for the socket ftp is using. This should succeed unless there is a kernel parameter that I can't remember that is set too small.

I dont think it is a problem with the ftp server as such, more with the tcpip stack in the kernel. I could be way off base here though and short of looking through the kernel set up, can't think of anything else you can try.

[Steven E. Protter]

Check the permissions on the file ftpd

Do you have the latest hp binaries for ftpd that solved the problem that the last version of wu-ftpd did not respond correctly to entries to block root ftp in the /etc/ftpusers file.

That may now be available by patch, but you should check it.

SEP

[Zigor Buruaga · Accepted solution]

Hi,

"tcp_recv_hiwater_def:

The maximum size for the receive window. [4096,-]
Default: 32768 bytes

This can also be thought-of as the default receive socket buffer (aka
SO_RCVBUF) size. It is used for any connection using an interface that
is NOT marked as either a "long, fat pipe" (LFP) or a "long, narrow
pipe." (LNP) Virtually all interfaces save perhaps PPP interfaces are
NOT marked as LNPs or LFPs so this is the tunable you would most
likely want to change."

Extracted from ftp://ftp.cup.hp.com/dist/networking/briefs/annotated_ndd.txt

Check with ndd that value on ( the same document mentions other values ) both machines, maybe you could find something useful.

Hope this helps.
Kind regards,
Zigor

[Marty Hoff]

it was the tcp_recv_hiwater_max. I changed it to match the system that was working and it started working just fine. Thanks for the help.

Marty