Can't add host server to cloudstack management server - brand new installation.

[clemylton]

problem

I did a fresh install and when I try to add the KVM virtualization hosts I get the following error message;
Unable to add the host: Cannot find the server resources at http://10.20.123.4

versions

CloudStack 4.20.1.0
OracleLinux R9 U6
Openjdk 17.0.15 2025-04-15 LTS
QEMU emulator version 9.1.0

The steps to reproduce the bug

1.I installed and updated the OS on the management server, I configured the bridges brcloud0 for management and brcloud1 for guest and public
2.I installed and updated the OS on the KVM Hosts servers, I configured the bridges brcloud0 for management and brcloud1 for guest and public
3.I tested connectivity between hosts via the management network using the FQDN
4. I accessed the management server through the GUI and created the zone, pod and cluster. Everything is OK, everything is enabled, no errors.
5. I click on the add host button, and fill in the information and try to add the host, that's when I get the error message
...

What to do about it?

I put all the logs in debug mode but I can't get a clue about the problem

----------------- LOGS FROM THE KVM HOST --------------------

[root@cshost02 ~]# tail -n 50 -f /var/log/cloudstack/agent/agent.log
2025-07-03 17:06:09,186 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [guid] has empty or null value. Using default value [null].
2025-07-03 17:06:09,187 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [developer] has empty or null value. Using default value [false].
2025-07-03 17:06:19,903 INFO [cloud.agent.AgentShell] (main:[]) (logid:) Agent started
2025-07-03 17:06:19,907 INFO [cloud.agent.AgentShell] (main:[]) (logid:) Implementation Version is 4.20.1.0
2025-07-03 17:06:19,909 INFO [cloud.agent.AgentShell] (main:[]) (logid:) agent.properties found at /etc/cloudstack/agent/agent.properties
2025-07-03 17:06:19,914 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [host] was altered. Now using the value [localhost].
2025-07-03 17:06:19,937 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [guid] has empty or null value. Using default value [null].
2025-07-03 17:06:19,937 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [developer] has empty or null value. Using default value [false].
2025-07-03 17:06:30,662 INFO [cloud.agent.AgentShell] (main:[]) (logid:) Agent started
2025-07-03 17:06:30,666 INFO [cloud.agent.AgentShell] (main:[]) (logid:) Implementation Version is 4.20.1.0
2025-07-03 17:06:30,667 INFO [cloud.agent.AgentShell] (main:[]) (logid:) agent.properties found at /etc/cloudstack/agent/agent.properties
2025-07-03 17:06:30,673 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [host] was altered. Now using the value [localhost].
2025-07-03 17:06:30,696 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [guid] has empty or null value. Using default value [null].
2025-07-03 17:06:30,696 DEBUG [agent.properties.AgentPropertiesFileHandler] (main:[]) (logid:) Property [developer] has empty or null value. Using default value [false].
2025-07-03 17:06:41,402 INFO [cloud.agent.AgentShell] (main:[]) (logid:) Agent started

[boring-cyborg[bot]]

Thanks for opening your first issue here! Be sure to follow the issue template!

[clemylton]

Some details I forgot;

• I had to set SHA1 as default to be able to install the agent -> update-crypto-policies --set DEFAULT:SHA1
• I had to create the file /etc/sysconfig/libvirtd to add the line LIBVIRTD_ARGS="--listen" couse i couldnt find it after OS installation
• I'm using the Shapeblue repository

any help is greatly appreciated

[weizhouapache]

Some details I forgot;

• I had to set SHA1 as default to be able to install the agent -> update-crypto-policies --set DEFAULT:SHA1
• I had to create the file /etc/sysconfig/libvirtd to add the line LIBVIRTD_ARGS="--listen" couse i couldnt find it after OS installation
• I'm using the Shapeblue repository

any help is greatly appreciated

@clemylton
have you configured the kvm network label (brcloud0/brcloudbr1) for physical networks in the zone creation wizard?

[clemylton]

Hi weizhouapache

Yeah;

[rajujith]

@clemylton can you check the value of 'host' in the global settings? It must be set to the management server IP if not updated by default.

[clemylton]

Hello rajujith

Yes, I have checked this item and set the IP of the management server. Still the problem persists. I have checked the status of all installed services and they are all running without errors. I still have no clue what might be causing the problem.

[Pearl1594]

@clemylton what are the name of the bridges on the host. Because you mentioned brcloud0/1 but the traffic label has been set to cloudbr0/1

[clemylton]

Hi Pearl1594

Sorry, it was a typo. My fault. The bridges are named cloudbr0 and cloudbr1.
What I find strange is that following exactly the same procedure, I don't have this problem in version 4.19. Has any detail changed for version 4.20? I can't find anything. Apparently the process is identical.

[clemylton]

Thanks for your attention, everyone.
I'm back to version 4.19. Everything works perfectly.

[weizhouapache]

Good you found the workaround..

it is a strange issue