Workspace App latest for Linux : Cannot connect to 0.0.0.2 - only when using Mobile Phone Tethering/AccessPoint ( wifi/USB/Bluetooth )

[yan mer]

Issue:

Workspace App latest for Linux : ( Error popup when clicking the app in the portal )

 

Cannot connect to "0.0.0.2 - AppName" :

Address family not supported by protocol. Verify your connection settings and try again.

=Quit=

 

Happening 

only when using Mobile Phone Data connection ( 3g/4g/LTE) Tethering/AccessPoint ( wifi/USB/Bluetooth )

 

Tried known workarounds :

ProxyUseFQDN=Off is already off

I reverted back to 13.8

 

Also tried this from the solutions online : ( but I didnt expect it to work, since it works when Linux OS has internet connectivity through normal ISP wifi/ethernet )

replaced /opt/Citrix/ICAClient/keystore/cacerts

by a symlink to : /etc/ssl/certs

also trieed a symlink to : /usr/share/ca-certificates/mozilla

 

both didnt worked, also those target directories were populated with certificates

 

 

Please let me know if you have a fix for this issue, or how we can proceed to diagnose it further

[yan mer]

I tested with

- two different laptop dell and lenovo

- three different OS Windows 10 , Linux Mint, Android

- many different internet connections, ISP Wifi, ISP wired, 4g mobile Tethering USB/Bluetooth/Wifi AP

 

The only combination showing the issue is Linux + mobile Tethering

I suspect the Citrix Client for Linux having an issue, since all the rest of internet connectivity is working fine on linux + mobile tethering

 

I want to take this to Citrix Tech support, how could I contact the right support technical group for Linux version of the Workspace App ?

[yan mer]

The bug seems to affect Citrix Portal / Citrix Workspace App Client under Linux ONLY when Mobile Phone's APN is IPv6

When I force it back to IPv4, its working

 

Yesterday I tested with 3 other mobiles iphones and android, none of them exhibited the issue ( they were APN IPv4 only )

 

- This issue does not manifest under Windows10 or Android ( even when APN is IPv6 )

- All other Linux network communication works fine, only citrix client/portal is affected ( While APN is IPv6 )

 

To reproduce the issue :

With Linux, connect to the internet through a Mobile with IPv6 on the APN, confirm the mobile obtains a IPv6 address in "Mobile Network Diagnostics" screen

Reload the Citrix portal, and click to download/launch  the .ica

 

Citrix Support, can you bring this issue to Dev team to have them fix the Linux Client so that it will work like the WIndows/Android one

even when there is IPv6 used upstream in between it and the portal ?

 

thanks !

[yan mer]

I found the problem is fixed when I disable IPv6 on Linux OS

Then, it doesnt matter if it is used on the AP, it wont use it

Two ways to disable it, with sysctl or this :

nmcli con mod 95b13bee-9ebd-442e-8eb3-66a8816f6535 ipv6.method disabled

nmcli con 95b13bee-9ebd-442e-8eb3-66a8816f6535 up

 

route -6 will then not show this route for IPv6

[::]/0                         _gateway                   UG   600 9     0 wlp2s0

this confirms IPv6 will not be used

 

I can confirm tested this on Windows with IPv6 routing enabled, it works

 

Why IPv6 support not yet working in Linux for citrix ?

[yan mer]

IPv6 is supposed to be supported by Citrix for Linux Client :

https://docs.citrix.com/en-us/citrix-workspace-app-for-linux/citrix-workspace-app-for-linux.pdf

 

Page 20 :

 

2203 What’s new Support for EDT IPv6 Starting with this release, Citrix Workspace app supports EDT IPv6