sql server - How can i choose an Authentication Mode If i do not have permits? -

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i can start sql server windows authentication mode. want change mixed mode. tried following:

  1. in sql server management studio object explorer, right-click the
    server, , click properties.
  2. on security page, under server authentication, select new server authentication mode, , click ok.
  3. in sql server management studio dialog box, click ok to
    acknowledge requirement restart sql server.
  4. in object explorer, right-click server, , click restart. if sql server agent running, must restarted.

in second step error:

enter image description here

i not have permissions make changes. account not have right carry out change. tried assign login sysadmin failed. tells me:

enter image description here

what should do? should reinstall , configure authentication on mixed mode?

you donot need reinstall sql server instance. instead follow below given steps

1]change registry follows

"software\microsoft\microsoft sql server\sqlexpress\loginmode" = 2

2]once change value in registry,follow below given url

http://msdn.microsoft.com/en-us/library/ms188670.aspx


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