Upload hangs at 100%

TLDR - Quick Summary

Problem: File uploads hang at 100% and never complete (pre-v3.3.5)

Config: Edit /opt/sftpgw/sftpgateway-admin-api-{version}.conf and add -DAZURE_REQUEST_WRITE_TIMEOUT=0 -DAZURE_REQUEST_READ_TIMEOUT=0 -DAZURE_REQUEST_RESPONSE_TIMEOUT=0 to JAVA_OPTS

Apply: service sftpgw-admin-api restart; set SFTP client timeout to 0

Overview

In recent iterations of SFTP Gateway version 3, there is an intermittent issue where a file being uploaded will hang at 100% completion and won't finish the upload transfer.

This article covers the workaround to the issue if you're not using version 3.3.5 or higher, which includes the fix.

Workaround

SSH into the VM and navigate to /opt/sftpgw.

There you will find this file:

sftpgateway-admin-api-{version}.conf

Edit this file and you will find this line:

JAVA_OPTS="-Xms256m -Xmx1024m -XX:MaxPermSize=512m -server -Daws.crt.lib.dir=/opt/sftpgw/tmp -Djava.io.tmpdir=/opt/sftpgw/tmp"

You want to change it to the following:

JAVA_OPTS="-Xms256m -Xmx1024m -XX:MaxPermSize=512m -server -Daws.crt.lib.dir=/opt/sftpgw/tmp -Djava.io.tmpdir=/opt/sftpgw/tmp -DAZURE_REQUEST_WRITE_TIMEOUT=0 -DAZURE_REQUEST_READ_TIMEOUT=0 -DAZURE_REQUEST_RESPONSE_TIMEOUT=0"

To apply these changes, restart Java:

sudo su
service sftpgw-admin-api restart

Also, you may want to set the timeout limit in your SFTP client to a large value, or 0, which for clients such as FileZilla or WinSCP means an infinite timeout.