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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / AOS crashed Object Ser...
Microsoft Dynamics AX (Archived)

AOS crashed Object Server 01: Session Allocation Failed: Session XXis already allocated.

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Posted on by Community Member

Hello,

I got this Problem:

Error

Object Server 01:  Session Allocation Failed: Session XX is already allocated.

Object Server 01:  Unexpected situation
 More Information: Session Allocation Failed: Session is already allocated.

cause

I guess AX try to set the same session ID for a user or worker.

https://community.dynamics.com/ax/f/33/t/135407

infrastructure

AX 2012 R2 CU7

Kernel: 6.2.1000.9871

Application: 6.2.1000.4051

2x AOS-server cluster

4x terminal-server

Walkthrough

This is the first time I got this error, I can found a reason. Got someone a walktrough to solve this problem?

*This post is locked for comments

I have the same question (0)
  • Martin Dráb Profile Picture
    Martin Dráb 237,801 Most Valuable Professional on at

    Can you tell us more? When did you get this error? (E.g. on AOS start, when performing some action or so.) Did you make any configuration changes recently?

    If it wasn't just one-off issue, configure Windows to collect AOS crash dumps and upload one to LCS for analysis. It may give you more information and suggest some hotfixes to install.

  • Verified answer
    Community Member Profile Picture
    Community Member on at

    I found the reason:

    My cluster was broken, so AOS1 was inactive. The second AOS got an entry:

    Object Server 01:  Server SERVER-AXAOS1 with ID 1 is marked as inactive as it has not updated its last alive time.

    Object Server 01:  Releasing sessions for SERVER-AXAOS2@2712 server with ID 1 that is currently marked as dead.

    So I guess: Orphaned Sessions in SYSCLIENTSESSIONS

    There was a short interrupt between AOS1 und DB-SERVER.

    The DB of AX-IDs could not be cleared.

    The users on AOS2 get a session which exists in the DB

    So AOS2 crashed.

    Solution

    I restarted the AOS1 Server.

    The AOS1 Server was in cluster again.

    The DB-IDs was cleared.

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