Protected Sheet - Macro To Unprotect, Refresh Sql Query & Re-protect Fails

I have a protected worksheet containing an SQL query. I have two cells on the worksheet unlocked so that users can enter fresh parameters to feed the query.
Because I have to use MS Query to interrogate our SQL server (current IT decree), the query won't support parameters directly when the query cannot be represented graphically - so I have to manually edit the sql command text and then refresh the query - or at least that was why I wrote the code below

The problem: My macro won't unprotect the sheet before it calls the SQL.it therefore won't update the sheet to detail the DSN, command text and number of parameters (latter should be 0) - info just used to verify queryit won't run the query / return the data as the sheet is still protected Comment: I have had to remove sheet protection in order to allow the sql to execute and return data. If protection is removed, the query does execute and return data ( changes in the "parameter" cell contents do cause the query to be correctly modified)
I could comment out the debug info but the query still doesn't return data if the sheet is protected.

Activesheet And worksheets(ndx) where ndx has been defined As ActiveSheet.Name
I apologise If my post Is difficult To follow - especially the code.

Sub AgedStockParameters()
nmb = ActiveWorkbook.Name
ndx = ActiveSheet.Name
Workbooks(nmb).Activate
Worksheets(ndx).Activate
ActiveSheet.Range("A1").Select
WkshtQryCon = Workbooks(nmb).Worksheets(ndx).QueryTables(1).Connection
ActiveCell.Value = WkshtQryCon
Range("A2").Select
WkshtQryFld = Workbooks(nmb).Worksheets(ndx).QueryTables(1).CommandText
ActiveCell.Value = WkshtQryFld.......................