After NetScaler HA failover, sometimes the existing rdp session via SSLVPN rdpprofile fails to reconnect with error "This computer can't connect to the remote computer."

Set rdpCookieValidity in rdpClientProfile with larger value:
set rdp clientprofile rdp -rdpCookieValidity <DesiredValue>

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Problem Cause

Whenever there is network disruption or failover, RDP client tries to reconnect, in this case the reconnection will be successful based on rdpCookieValidity period configured on the rdpClientProfile. If the reconnect or failover happens after cookie timeout value, the reconnection will not be honored.