topic FTP Problem ?? Wierd in Operating System - HP-UX

FTP Problem ?? Wierd

Richard Ace — Tue, 16 Apr 2002 10:33:17 GMT

Can anyone sugguest anything as to why this FTP process is "Bailing out" at the end", though it say its completed ????
"Access Restrictions??"
"Large File timeout ????"
"inetd.sec??"
Ideas but not checked as yet.

Connected to 172.24.76.13.
220 inl032 FTP server (Version 1.1.214.8 Fri Apr 20 07:27:42 GMT 2001) ready.
Remote system type is UNIX.
Using binary mode to transfer files.
331 Password required for wm7260.
230 User wm7260 logged in. Access restrictions apply.
200 Type set to I.
250 CWD command successful.
200 PORT command successful.
150 Opening ASCII mode data connection for /usr/bin/ls.
total 0
226 Transfer complete.
Local directory now /app/as400/news/referentiel/traites_gfs/20020416_041001
421 Service not available, remote server has closed connection
Not connected.
421 Service not available, remote server has closed connection
Not connected.

Re: FTP Problem ?? Wierd

Emiel van Grinsven — Tue, 16 Apr 2002 10:56:00 GMT

Hi,

Some questions:
is it the same for root too?
Check dir permissions,
check shell,
Did it work at some time?

cu, Emiel

Re: FTP Problem ?? Wierd

Jeff Schussele — Tue, 16 Apr 2002 13:56:05 GMT

Richard,

If network HW/media problems can be definitively ruled out then I would suspect that some TCP tuning may be in order. in /etc/rc.config.d/nddconf
Check tcp_keepalive_interval

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x692bcbaac6dcd5118ff40090279cd0f9,00.html

Also via lanadmin/ndd check the MTU size & pmtu strategy

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x58a0d5fab40ed6118ff40090279cd0f9,00.html

Here's some other good threads on this subject

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x08621012aa92d5118ff10090279cd0f9,00.html

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x3e745220af9bd5118ff10090279cd0f9,00.html

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xcaa279bffde7d4118fef0090279cd0f9,00.html
http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0xe1b14e49c5cdd5118ff40090279cd0f9,00.html

HTH,
Jeff

Re: FTP Problem ?? Wierd

Richard Ace — Tue, 16 Apr 2002 14:13:56 GMT

No it is not the same for root it also only seems to be this server in France that FTP's in at 4 AM. I do not have access to the server in France or its IP address. I therefore can
not check the Directory permissions. Yes it did work, but not last night. I have just found out that this has happened 5 time last month.

I only have access to the destination server.

So trying to identify this message is now becoming a "No Go". Unless you have any more idea's.

I cannot be sure that it is an itermitant network problem.

I would just like to prove it.

Jeff does your Techy tips still stand for the Destination Server of the of the FTP process

Cheers

Rich

Re: FTP Problem ?? Wierd

Jeff Schussele — Tue, 16 Apr 2002 14:26:25 GMT

Richard,

The server "remote" to the logging server is closing the connection.
Now this may be because:
A) it not waiting long enough for acks to packets rec'd - in that case IT needs the keepalive adjusted or possibly it's TCP window size increased
B) The ack never reaches it - network problem.

And I would definitely verify that the hosts involved have = MTU sizes as well the next-hop routers for each.

Another possibilty to be checked is the network activity in France as this is a popular time (04:00) for backups & the network may be choking over there & "losing" your ack packets.

In my experience almost all "remote connection closed" are due to a network problem - either physical, performance or host/net config.

Rgds,
Jeff

Re: FTP Problem ?? Wierd

Richard Ace — Tue, 16 Apr 2002 15:53:18 GMT

Hu!
MTU Set to 1500, but KEEP_ALIVE is not set in the /etc/rc.config.d/nddconf all there is, is a completely commented file?? maybe this needs to be configured as it maybe picking up the default settings what every they may be.

I find out about the network traffic from France.

Cheers

Rich

Re: FTP Problem ?? Wierd

Jeff Schussele — Tue, 16 Apr 2002 15:57:48 GMT

KEEP_ALIVE defaults to 2 hours, I believe. But if this is a large file(set) & takes longer it may need to be increased.

Jeff