Question : Select table data from a different SQL instance?

I have a production SQL instance "Host1\SQL1" and a testing SQL instance "Host1\SQL2". I've trying to copy data from the Production SQL instance to the testing SQL instance, like this:
(but it isn't working) What as I missing?
(running SQL from "Host1\SQL2")
UPDATE    PageTemplates
SET              TemplateText =
                          (SELECT     PT1.TemplateText
                            FROM          [Host1\SQL1].MyDB.PageTemplates AS PT1
                            WHERE      (PT1.TemplateID = 1))
WHERE     (TemplateID = 1)

Answer : Select table data from a different SQL instance?

FIrst, I assume if you run this fragment in a new query window, you get the result you are looking for:

SELECT     PT1.TemplateText
FROM          [Host1\SQL1].MyDB.PageTemplates AS PT1
WHERE      (PT1.TemplateID = 1)

If not, what result do you get?

(BTW, I just noticed - shouldn't that be FROM [Host1\SQL1].MyDB.dbo.PageTemplates AS PT1    -- add the dbo?)

Second:  Do you get an error when you run your update?

Third:  Try making both instance/DBs explicit, e.g.:

UPDATE    [Host1\SQL2].MyDB.dbo.PageTemplates
SET              TemplateText =
                          (SELECT     PT1.TemplateText
                            FROM          [Host1\SQL1].MyDB.dbo.PageTemplates AS PT1
                            WHERE      (PT1.TemplateID = 1))
WHERE     (TemplateID = 1)