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If you are using 4.2.x in your office, you need to use the same version to resume a connection that was in standby. You can get the version of it with SCP it from pslogin in this path: /reg/common/tools/admin/nomachine

Other issues

If Ctrl-C (Ctrl-break) does not work on the Linux client, hit the Alt-Ctrl-C (Use it in proper sequence so hold down the key one at a time). WindowsKey-Ctrl-C, or turn on Caps Lock and hit Ctrl-C will also work.