Additional DNS suffix is getting added when nslookup is performed to any site.

The reason for seeing DNS suffix getting added while doing nslookup with any FQDN is due to DNS DEVOLUTION (which is a Microsoft feature). Windows does this suffix addition and not the Citrix gateway plugin.

Please refer the below Microsoft document for understanding Windows DNS Devolution:

https://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/ee683928(v=ws.10)?redirectedfrom=MSDN%3Chttps://docs.microsoft.com/en-us/previous-versions/windows/it-pro/windows-server-2008-R2-and-2008/ee683928(v=ws.10)?redirectedfrom=MSDN

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