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Domain names that are in the 30-day Redemption Grace Period can be redeemed (or renewed) before the end of the Grace Period. If you tried to redeem (or renew) your domain name that is in Redemption Grace Period, but were unable to do so, the registrar may be in breach of the Expired Registration Recovery Policy. Your registrar must provide three renewal notices and allow a domain in Redemption Grace Period to be redeemed (or renewed).

http://www.icann.org/en/resources/compliance/complaints/renewal/grace

Why I can not renew my domain?