Take the 2-minute tour ×
Server Fault is a question and answer site for professional system and network administrators. It's 100% free, no registration required.

On our ISA system the following warning is logged:

Event Type: Warning
Event Source: Microsoft ISA Server Storage
Event ID: 21326
Description: The ISA Server VSS Writer encountered a failure while backing up 
the ISA Server configuration.

The system configuration is:

  • Windows 2003 Standard SP 2
  • Microsoft ISA 2006 SP 1

Backup agent: EMC NetWorker 7.5.2.4

Running vssadmin list writers returns

Writer name: "ISA Writer"
Writer Id: {25f33a79-3162-4496-8a7d-caf8e7328205}
Writer Instance Id {f958b2f0-7ad1-4326-9ddc-51aee0ef24c4}
State: [8] Failed
Last error: Retryable error

I'm looking for any hints on what's going wrong here and how I can fix this.

share|improve this question

1 Answer 1

up vote 0 down vote accepted

The cause for this issue is that the function CryptSignHash passes AT_SIGNATURE as a parameter. This will fail if the "signature" key pair / certificate is missing. See http://msdn.microsoft.com/en-us/library/aa380280(v=vs.85).aspx

The only supported solution is to set up the machine and ISA Server from scratch.


An unsupported solution ist to create a new key container for ISA.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.