Changing the IP address Impact on Agent and Policy server
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Changing the IP address Impact on Agent and Policy server


Article ID: 11533


Updated On:


CA Single Sign On Secure Proxy Server (SiteMinder) CA Single Sign On Agents (SiteMinder) SITEMINDER


Changing IP addresses on Agent / Policy server Impact on Trusted Relation.

- What is the Impact of Changing the IP of the server where the Web Agent is installed on the Trusted Relation with the Policy server

- Also what would be the impact of changing the IP of the Policy sever on the Encryption Key 



Component: Web Agent; Access Gateway

Version: ANY

Operating Systems: ANY


On the Web Agent Side , the system HostID is used during the encryption of the shared secret in the SmHost.conf file.

So if change of IP results in the change of HostID , then it will make the current shared secret invalid, requiring you to re-register the trusted host.

However, if the change of IP doesn't result in the change of HostID, then there won't be any impact with regards to the shared secret.

Now, different OS has different approach on how they compute system HostID. Some use IP address during this calculation while others don't.

Please refer to respective vendor documentation to confirm if the IP change will have any impact with the system HostID.

For e.g for Linux please refer :


On the Policy server Side however,HOSTID is not used during the encryption of EnryptionKey.txt file. 

So change of IP address/Mac address etc. have no impact on Policy server side.


Additional Information

gethostid - Linux