Hi @ManuShankar, you can edit the windows registry to change the default of 1 Day. but as far as i know windows handels DNS very well, and store only valid DNS, so that should not be the problem. but you will need to check this behavior further as i mentined the problem could be that the GP-users internet traffic going through the tunnel, because ive seen this before in my case the traffic was going thoruhg the tunnel to the internet which gave the users a Public ip that it can not reach the other service (in your case SFTP Public IP).
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