Notification
Risk classification
HIPER (High Impact and/or Pervasive)
Risk categories
Recovery and Availability
Affected Domain
DS8A00 and DS8900 systems that are using IBM AOS infrastructure for remote product support.
Abstract
Client firewall, DNS, and proxy updates are required for continued AOS availability.
Description
REMINDER (Extended) - Action required no later than 1 March, 2027
Client firewall, DNS, and proxy updates are required for continued AOS availability.
Client firewall, DNS, and proxy updates are required for continued AOS availability.
In addition, some DS8900F systems will require ICS (Install Corrective Service) installation.
AOS Hosting Changes:
Host Name | Current IP | Next IP | Date of Change |
aoshats.us.ihost.com | 72.15.223.62 | 169.63.158.183 | 1 March, 2027 |
aosrelay1.us.ihost.com | 161.156.100.165 | – | – |
aosback.us.ihost.com | 150.238.213.135 | – | – |
Note:
If AOS is not available, IBM Remote Support will not be able to access the DS8k system. An SSR will be required onsite to provide laptop access.
If AOS is not available, IBM Remote Support will not be able to access the DS8k system. An SSR will be required onsite to provide laptop access.
Recommended Action
Fix:
REQUIRED:
All DS8A00 and DS8900F systems must have DNS Enabled, or firewall/proxy configuration that provides access to AOS host servers, no later than 1 March, 2027. Without these updates, AOS will no longer work after 1 March, 2027.
REQUIRED:
All DS8A00 and DS8900F systems must have DNS Enabled, or firewall/proxy configuration that provides access to AOS host servers, no later than 1 March, 2027. Without these updates, AOS will no longer work after 1 March, 2027.
IBM strongly recommends firewall settings using FQDN filtering instead of IP addresses.
IP addresses are subject to future changes.
IP addresses are subject to future changes.
– AND –
– DS8900F below R9.4 SP3 - 89.43.3.0: Update code to recommended bundle, or newer, or install ICS PFE_FixAOS_Consolidated_v2.5 or newer on both HMCs.
– DS8900F Customer Code Load users may activate ICS PFE_FixAOS_Consolidated_v2.5, by reinstalling their existing bundle.
– No code update or ICS required for DS8A00.
Required actions MUST be completed no later than 1 March, 2027
– No code update or ICS required for DS8A00.
Required actions MUST be completed no later than 1 March, 2027
How to use the preferred DS8000 Web User Interface (WUI) to change DNS settings
20 April 2026 update:
All customers on 89.42.18.0 must install ICS PFE_FixAOS_Consolidated_v2.5
All customers on code levels below 89.42.18.0 can use ICS PFE_FixAOS_Consolidated_v2.4 or ICS PFE_FixAOS_Consolidated_v2.5
To verify current fix content:
1) Using DS CLI (external server- standalone):
- Run offloadfile -config and open the generated file "ICSInstall.history"
2) Using Service WUI (customer login):
- Go to Updates
- Select HMC (Not SFI)
- Run Display Installed HMC Code Levels utility
Date first published
19 August 2025
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Document Information
Modified date:
28 May 2026
UID
ibm17241386