diff --git a/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java b/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
index 4281036d9456..9aff38624fa5 100644
--- a/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
+++ b/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
@@ -610,7 +610,7 @@ public class LibvirtComputingResource extends ServerResourceBase implements Serv
 
     public static final String CGROUP_V2 = "cgroup2fs";
 
-    public static final String AGENT_IS_NOT_CONNECTED = "QEMU guest agent is not connected";
+    public static final Integer AGENT_UNRESPONSIVE_ERROR_ORDINAL = 86;
 
     /**
      * Virsh command to merge (blockcommit) snapshot into the base file.<br><br>
@@ -7185,7 +7185,7 @@ public Map<String, Long> createDiskOnlyVmSnapshotForRunningVm(List<Pair<VolumeOb
         } catch (LibvirtException e) {
             String errorMsg = String.format("Creation of disk-only VM snapshot for VM [%s] failed due to %s.", vmName, e.getMessage());
             boolean isVmConsistent = false;
-            if (e.getMessage().contains(AGENT_IS_NOT_CONNECTED)) {
+            if (AGENT_UNRESPONSIVE_ERROR_ORDINAL.equals(e.getError().getCode().ordinal())) {
                 errorMsg = "QEMU guest agent is not connected. If the VM has been recently started, it might connect soon. Otherwise the VM does not have the" +
                         " guest agent installed; thus the QuiesceVM parameter is not supported.";
                 isVmConsistent = true;
diff --git a/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtValidateKbossVmCommandWrapper.java b/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtValidateKbossVmCommandWrapper.java
index eec68cd464e3..827588a6e6bd 100644
--- a/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtValidateKbossVmCommandWrapper.java
+++ b/plugins/hypervisors/kvm/src/main/java/com/cloud/hypervisor/kvm/resource/wrapper/LibvirtValidateKbossVmCommandWrapper.java
@@ -92,7 +92,7 @@ private boolean waitForBoot(ValidateKbossVmCommand cmd, Domain vm) throws Libvir
                     return true;
                 }
             } catch (LibvirtException ex) {
-                if (!ex.getMessage().contains(LibvirtComputingResource.AGENT_IS_NOT_CONNECTED)) {
+                if (!LibvirtComputingResource.AGENT_UNRESPONSIVE_ERROR_ORDINAL.equals(ex.getError().getCode().ordinal())) {
                     logger.error("Got an unexpected Libvirt Exception, giving up on validating VM [{}].", vm.getName(), ex);
                     throw ex;
                 }