A quick update for this bug: Today I tested the same scenario (Cipher aes128-ctr) on our test cluster using the latest Windows snapshot client, version 4.1.2.3-2021.07.13-df4a8ec. The issue as described in this bug report is still present. Thanks, Adam On Fri, Mar 19, 2021 at 2:28 PM Adam Dorsey - NOAA Affiliate < adam.dorsey@noaa.gov> wrote: > I can confirm this issue in my own environment as well. X2Go server > version is 4.1.0.3-9.el7 running on CentOS 7. Affected users are running > X2Go client version 4.1.2.2 on Windows 10 (though this may affect other > Windows versions as well). > > We forced the use of the aes128-ctr cipher yesterday on our cluster login > nodes to resolve a security issue raised by our security team. To do this, > we added the following line to our SSH server config file: > > Ciphers aes128-ctr > > After making this change, several users running the X2Go client on Windows > 10 could no longer connect. We found this bug report, and subsequently > reverted the above change, which resolved the issue. > > Please note that Linux clients appeared to be unaffected by this issue; I > was able to connect from a workstation running X2Go client version 4.1.2.2 > on Ubuntu Linux 20.04 without any issues. > > -- > Adam Dorsey > NOAA RDHPCS Systems Administrator Site Lead > CSRA / RedLine Performance Solutions, LLC > > NOAA NESCC > 1000 Galliher Drive, Suite 333, Fairmont, WV 26554 > office: (304) 367-2882 > cell: (304) 685-9345 > adam.dorsey@noaa.gov > -- Adam Dorsey NOAA RDHPCS Systems Administrator Site Lead CSRA / RedLine Performance Solutions, LLC NOAA NESCC 1000 Galliher Drive, Suite 333, Fairmont, WV 26554 office: (304) 367-2882 cell: (304) 685-9345 adam.dorsey@noaa.gov