[Info-vax] SFTP hang - from VMS to Windows

[GerMarsh]

Anyone seen anything like this?

We get intermittent hangs during file transfers - nothing consistent about which file will be affected nor their sizes.

Windows is running an OpenText (Hummingird) server. VMS is TCPIP Services V5.6 - ECO 2.

The "hang" can be kicked into life by trying an FTP connection to the same server!

The logfile shows something like this:
sftp> ascii

sftp> lcd /$1$DGA22/DATA/USERS/PC_SCHEDULE

/$1$DGA22/data/users/pc_schedule
sftp> cd /er_pc_root

/ER_PC_Root
sftp> put PC_ASCII_FILE.DAT

PC_ASCII_FILE.DAT     |   96kB |  96.0 kB/s | ETA: 00:00:23 |   4%
PC_ASCII_FILE.DAT     |  288kB | 144.0 kB/s | ETA: 00:00:14 |  12%
PC_ASCII_FILE.DAT     |  384kB | 128.0 kB/s | ETA: 00:00:15 |  16%
PC_ASCII_FILE.DAT     |  576kB | 144.0 kB/s | ETA: 00:00:12 |  24%
PC_ASCII_FILE.DAT     |  704kB | 140.8 kB/s | ETA: 00:00:11 |  29%
PC_ASCII_FILE.DAT     |  864kB | 144.0 kB/s | ETA: 00:00:10 |  36%
PC_ASCII_FILE.DAT     |  1.1MB | 155.4 kB/s | ETA: 00:00:08 |  45%
PC_ASCII_FILE.DAT     |  1.3MB | 168.0 kB/s | ETA: 00:00:06 |  56%
PC_ASCII_FILE.DAT     |  1.5MB | 174.2 kB/s | ETA: 00:00:04 |  65%
PC_ASCII_FILE.DAT     |  1.8MB | 185.6 kB/s | ETA: 00:00:02 |  77%
PC_ASCII_FILE.DAT     |  2.1MB | 192.0 kB/s | ETA: 00:00:01 |  88%
PC_ASCII_FILE.DAT     |  2.3MB | 194.7 kB/s | ETA: 00:00:00 |  97%
PC_ASCII_FILE.DAT     |  2.3MB | 182.2 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 169.1 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 157.9 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 148.0 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 139.3 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 131.6 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 124.6 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 118.4 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 112.8 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 107.6 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB | 103.0 kB/s | ETA: 00:00:00 |  99%
PC_ASCII_FILE.DAT     |  2.3MB |  98.7 kB/s | ETA: 00:00:00 |  99%
.
.
.
PC_ASCII_FILE.DAT     |  2.3MB |   3.1 kB/s | ETA: 00:00:06 |  99%
PC_ASCII_FILE.DAT     |  2.3MB |   3.1 kB/s | TOC: 00:12:46 | 100%
sftp> quit

The transfer sits at 99% with no throughput - and the associated average rate decreasing. 

There is nothing significant in the logs on the Windows side but I don't think the problem lies on the VMS end either.

Networks support also state that there is no contention on the network during these incidents.

The process is not really hanging as it is dutifully outputting its progress. Just sits in LEF state most of the time. Two BG devices in use but I would expect that. No process or pooled quota issues either.

As ever, any pointers gratefully received!




Gerald.