The HDX engine uses the cached DNS addresses during the Session Reliability reconnect after there is a network disconnect. Hence, it will try to connect to old gateway and fail after a GSLB failover. However with AutoClientReconnect, HDX engine gets destroyed and a new engine will not have anything cached. Hence, the reconnection will be successful here.

DNS Resolution on Reconnection with Session Reliability is disabled by default.
When enabled, it will delay the reconnection by few seconds depending on how much time will be taken to resolve the IP address of the SSL proxy host.
 

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Instructions

Add below flag to WFClient section in the Default.ica File on Storefront to resolve the issue:

DNSResolveOnReconnect=On

NOTE : Please make changes during off production hours 

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