This article was previously published under Q180935
This article has been archived. It is offered "as is" and will no longer be updated.
Under certain circumstances, when Event 23 outage 0x0A is reported by aDistributed Link Service, the reconnection fails with the following eventlog error:
Event ID: 77 Source: SNA Server Description: Connection <name> failed to activate due to failure at link service. Error Code = x0AFF
X'0AFF' - Duplicate destination MAC/SAP for link service%n
This problem occurs even when no other connections are configured to usethe link service that is running on the central server.
When the LAN session is broken between the remote link service (running inthe remote branch) and the central link service (running in the centraloffice), both SNA Server and the centralized link service receive a "lostlocality" message. However, in some cases, SNA Server receives a "lostlocality" before the centralized link service. This causes SNA Server toreissue a new Open(Link) request while the central link service stillbelieves its current connection is still active, causing the central linkto respond with error x0AFF (duplicate destination mac/sap for linkservice).
Microsoft has confirmed this to be a problem in SNA Server versions 3.0,3.0 SP1, 3.0 SP2, and 4.0.
This problem was corrected in the latest SNA Server versions 3.0 and 4.0U.S. Service Packs. For information on obtaining these Service Packs,query on the following word in the Microsoft Knowledge Base (without thespaces):
S E R V P A C K
With the fix applied, the distributed link service retries the Open(Link)request if it receives error 0x0AFF from the central link service.The updated module is: <snaroot>\system\snaremls.dll.
Branch Server Central ServerDLS Shared Link Host<-- Outage 0x0A ---- Close(Link) Rq -><-- Close(Link) Ok -- ... <-- Outage 0xAE -- (on LPI 09160001) ... ...-- Open(Link) Rq -> -- Open(Link) Rq ->(on LPI 0A160001) <-- Open(Link) Error 0x0AFF -- (on LPI 0A160001)<-- Open(Link) Error 0x0AFF -- -- Close(Link)Rq ->(on LPI 09160001)