Microsoft KB Archive/163018

= Distributed Link Service Does Not Reactivate Dropped Connection =

Article ID: 163018

Article Last Modified on 6/13/2001

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APPLIES TO


 * Microsoft SNA Server 2.11 Service Pack 1

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This article was previously published under Q163018





SYMPTOMS
If a connection between a remote SNA Server with a Distributed Link service and a central SNA Server that has the appropriate link service distributed is dropped, the Distributed Link Service does not attempt to reactivate the connection even if the "Maximum number of attempts" is set to "No Limit" on the "Connection Activation Limits" tab for that particular connection. In the SNA Administrator program, you will see the connection dropping to a status of "Inactive."



CAUSE
The SNA Server service was changed in SNA Server 2.11 to stop retrying connection activations if a link service reports an Open(LINK) failure. The SNA Server service only tries to reactivate the connection once after this outage occurs.

If the Distributed Link service, or the network, is not available at this time, the SNA Server service stops trying to establish the connection.



RESOLUTION
To resolve this problem:
 * Apply the update to SNA Server 2.11 Service Pack 1 that corrects this problem. The updated module is Snaremls.dll. See the Status section below for information on how to obtain the update.



WORKAROUND
To work around this problem:
 * In the SNA Server link service configuration, point to the same remote link service twice. For example: \\server\snadlc1; \\server\snadlc1. This causes the Distributed Link Service to automatically retry between these two remote links if one fails.



STATUS
Microsoft has confirmed this to be a problem in SNA Server version 2.11 Service Pack 1 (SP1). A supported fix is now available for 2.11 SP1, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.



MORE INFORMATION
In the update to SNA Server 2.11 SP1, a new registry value has been added to cope with Leased Links, which do not make use of the retry parameters. The new registry value specifies the delay in seconds (with a granularity of five-second intervals), before the outage message is generated. The default setting is 20 seconds.

The registry value is:   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Sevices\ \Parameters\ExtraParameters\RetryPeriod (REG_DWORD). With regard to the symptom, here is an example of what you may see with the SNA Server Data Link Control message trace enabled: |000000a1.000000a7 DLC   -- 10:45:15.54 <..'..i........u.>
 * 000000a1.000000a7 DLC   08160000->01020300 OPEN  LINK RSP ERROR
 * 000000a1.000000a7 DLC                      Err:0D0A
 * 000000a1.000000a7 DLC
 * 000000a1.000000a7 DLC    Header  at address 00CC44B4, 2 elements
 * 000000a1.000000a7 DLC   03102700 00890D0A 010004DC 0100A400
 * 000000a1.000000a7 DLC
 * 000000a1.000000a7 DLC    Element at address 011BD910, start 1, end 92

SNASER> .....A..u0..> <.Y...Y...Y...Y..>  <..D.............> <............   >
 * 000000a1.000000a7 DLC   53444C43 31202020 2020534E 41534552     
 * 000000a1.000000a7 DLC   03                                      <.

In the Application Event Log, this problem is logged as an Information event with Message ID 77 and is decoded as follows:

Connection  failed to activate due to failure at link service.

Error Code = 0D0A

EXPLANATION The node failed to activate a link service to establish the specified connection.

The reason for the failure is given by the error code, as follows:

X'0001' - Hardware initialization failure

X'0008' - Invalid XID length specified

X'000A' - Fatal LCC hardware error

X'000B' - Invalid link index

X'000C' - Open(Link) has insufficient data

X'000D' - Link connection timeout

X'000E' - Maximum connection count reached or internal resources exhausted

X'0011' - Close(Link) received while Open(Link) pending

X'0012' - Duplicate request

X'0A11' - X.25 PVC already in use

X'0AFF' - Duplicate destination MAC/SAP for link service

X'0D01' - Insufficient memory to locate link service

X'0D02' - Invalid SNA Server Domain

X'0D04' - Link Service not found

X'0D07' - Link Service not found

X'0D0A' - Unable to open pipe to link service

X'0D0B' - No room in service table for link service

X'0D0C' - Remote Server not found or inactive

X'0D0D' - Link Service not active at remote Server

X'0D0E' - Link service not available to Distributed Link Service

X'0D0A' - Unable to open pipe to link service

Additional query words: prodsna SP1 DLS Outage

Keywords: kbbug kbfix kbnetwork KB163018

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