While trying to get a site collection in browser, It gave me this error: "Access to this Web site has been blocked. Please contact the administrator to resolve this problem."
I understand, the site collection is being locked out! wanted to unlock by going to Central Admin web site. Central Administration > Application Management > Site Collection Quotas and Locks and select Not locked. but that also resulted an error.
Solution: Unlock the site collection using STSADM
stsadm -o setsitelock -url <site-collection-url> -lock none
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