Using Sharefile Storage Zone 3.4 on premise, unable to upload files to the on-premise storage zone while the cloud storage zone upload works with no issues.
Health checks in the cloud and on the storage zone controllers do not report any problems.
There are a few possible issues that can cause this problem.
Missing firewall rules
In the beginning of August 2016 Sharefile have changed their public IP range that can be used to communicate to your on-premise storage zone. Make sure you have appropriate firewall rules in place.
The IP ranges are documented here: http://support.citrix.com/article/CTX208318
TLS 1.2 not being supported with SCZ 3.4
If you are using sharefile storage zone controller 3.4 on Windows Server 2012R2 you need to either update storage zone to v4.0 or disable TLS 1.2 on the server.
Instructions on disabling TLS 1.2 on a Windows server can be found here: https://technet.microsoft.com/en-us/library/dn786418(v=ws.11).aspx
You can identify the TLS handshake issues by looking at the system event log on the storage zone controller, you will see SCHANNEL errors.