وجود Event id 5501 در Log های DNS سرور

طبق لینک زیر این Error را یک چیز طبیعی تفسیر کرده و نیاز به کار خاصی نیست

Event ID 5501 — DNS Server Message Processing

ولی در لینک زیر مشکل را در تجزیه و تحلیل نادرست رکورد OPT ذکر کرده

When you query for a name on a Domain Name System (DNS) server that is running Windows Server 2008 R2, the DNS service may parse the OPT record in a DNS response packet incorrectly. Therefore, a DNS response packet is marked as invalid, and a "Server Failure" error is returned to the client. This name resolution failure can cause connectivity failures.

When this issue occurs, DNS Event ID 5501 is logged in the event log, together with the following message:

The DNS Server encountered a bad packet from <ip of remote DNS serve>. Packet processing leads beyond packet length. The event data contains the DNS packet.

که برای حل این مشکل باید Hotfix مورد نظر در لیک زیر را نصب کنید.

Responses are incorrectly marked as invalid on a DNS server in Windows Server 2008 R2