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Event ID: 21056 Source: MicrosoftH.323
Source
Level
Description
An error has been returned by the <WSAJoinLeaf> API. API error code: 00002751H. API error text: A socket operation was attempted to an unreachable host.
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Comments
This issue typically occurs when another service or another program that is running on the Windows SBS-based computer is accessing the H.225 remote access ports. See ME937534 to resolve this problem.
This error usually indicates that the communication between the 2 hosts failed. If the remote computer is operational, verify that there is no issue with the network (routing, firewalls, switches).
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