Thanks Ramy for your prompt reply. Port 34210 on HQ Server is open and all shops can check balance and redeem voucher which are sold from the other two stores. I have now done further investigation and the voucher from these 5 stores are showing valid and online until 401 is run on one particular store. As soon as 401 is finished on this particular store then the Voucher shows offline. Reason I said offline is because when I run a SQL command select *from voucheronline on HQ Administrator, the voucher sold from 5 stores are not there. How do make these vouchers online?
I also have another issue on the same 5 stores. When customer return goods we issue credit voucher. Now the balance on these credit voucher will revert back to £0.00 as soon as 401 completes on one particular store however the voucher still shows online unlike sold voucher which says voucher does not exist, and balance could be checked from all stores which says £0.00. This is causing too much problem.
All this happen only after 401 completes on one particular store.