Troubleshooting
Problem
421 Timeout (900 seconds): closing control connection. (SCI71137)
Symptom
421 Timeout (900 seconds): closing control connection.
Replies 150 and
226 arrive in the same TCP buffer.
Cause
Replies 150/226 in one TCP buffer causes FTP client session failure.
Resolving The Problem
Apply Post CUM1205 P122704 which includes fix 34050.
FIX 34050 SR 1338368
Replies 150/226 in one TCP buffer causes FTP client session failure.
When a LIST command is issued by the C:E FTP client, and the reply
contains both the 150 and 226 msgs in one TCP buffer, the session hangs
for FTP_DEFAULT_DISCINTV plus 5 seconds after which the FTP session is
lost, reply code 605 is generated by the client, the HCRC variable is
set to 16, and the summary log record has fail code 146. This occurs
whether or not there is any data sent back on the DP. If data is sent
on the data port, the resulting batch containing the directory listing
is marked incomplete. This fix addresses these problems as summarized
in the following table. As part of this fix, the MAXRC variable is
checked and possibly updated for each REPLY.n variable set. This may
require script changes if the final value of this variable changes.
F34050 Data Incomplete Hang MAXRC HCRC Summary
Applied Sent Batch Time FailCode
------- ---- ----------- ---- ----- ---- --------
N N D+5 605 16 146
N Y Y D+5 605 16 146
Y N 0 600 0
Y Y N 0 226 0
ACTION: As part of this fix, the MAXRC variable is checked and possibly
updated for each REPLY.n variable set. This may require script changes
if the final value changes.
MODULES UPDATED: STFTPC45,STREXX08
LOAD MODULES AFFECTED: STFTPC45,STREXX08
Historical Number
PRI31624
Product Synonym
[<p><b>]Change[</b><p>];New connection;[<p><b>]Fact[</b><p>];Connect:Enterprise OS/390;Release 1.2.00 [<br/>] At CUM1204 [<br/>] FTP auto ;connect [<br/>] SCI71137
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Document Information
Modified date:
17 December 2019
UID
swg21523091