Black screen in VDI desktop on a Particular lan segment

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Hi All,   

When we are connecting the Customer VDI from our internal lan (10.x.x.x) we are getting the VDI screen as black screen, but at the same time when we are connecting the same vdi from other than 10.x.x.x subnet we are getting the VDI screen as win 7

VDI Server in Customer premises and we are connecting with VM horizon Client

Thanks

Sudhakar