In Citrix Gateway VPN environment, you may observe the following issue when "Transfer Login": 

• After clicking "Transfer" on Client VPN plugin, the button keeps spinning (loading) and stuck. 

Logs investigation show the following clues: 

• Problem can only be observed in Non-English language setting (Plugin > Configuration > Language). 
• nstrace shows no response from NetScaler Gateway vServer for "POST /cgi/tlogin"

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Firstly, if you're running in a version without the fix, please upgrade your NetScaler (ADC) to the latest build. 

If issue is not resolved after upgrading, please try the following workaround to replace the according file forcedly again (Please do this with Citrix Technical Support's help). 

1. Login to Citrix NetScaler CLI's shell. Edit file: /var/netscaler/gui/vpn/pluginlist.xml and modify the last build number +1. For example, with below version number 22.2.1.103, change it to 22.2.1.104. 

<plugin
    name="Netscaler Gateway RfWeb GUI" type="RFWEB-GUI"
    version="22.2.1.103" path="/logon/logonPoint/"
/>

2. Run the following commands after saving pluginlist.xml file.

rm -rf /netscaler/ns_gui
ln -s /var/netscaler/gui /netscaler/ns_gui

3. Reboot to clear static cache. 

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Problem Cause

This issue actually has been fixed in the Citrix NetScaler (ADC) 13.0 Build 47.24: Release Notes for Build 47.24 of Citrix ADC 13.0 Release

• The Transfer Login page for an existing user does not work in languages other than English.
  [From Build 47.22]
  [# NSHELP-19859]

By upgrading NetScaler server, the related client plugin files should be fixed too with a forced auto upgrade. However, you may observe the issue again in a fixed version. That's possibly due to a file replacement failure on Client side due to cache. 

[GW plugin] Transfer button is not working for non-English languege