BYOC Edge MTLS handshake timeout on v2.5.0

Voice & Telephony
1

BYOC Edge v2.5.0 in us-west-2 hangs on MTLS validation. The Resource Center article for BYOC Network Requirements lists a 60-second timeout, yet the handshake aborts at 30 seconds. It’s not throwing a 403.

  • Logs indicate SSL_ERROR_HANDSHAKE_FAILURE.
  • Chain matches the Certification Guide.
  • [Screenshot: Stack status CREATE_IN_PROGRESS].
  • Latency metrics are doing jack all.
  • curl -v returns Connection reset by peer.
2 
BYOC_EDGE_CONFIG:
 NETWORK_TIMEOUT_MS: 65000
 MTLS_RETRY_COUNT: 2
 API_INTEGRATION_MODE: STRICT
 CERT_VALIDATION: ENABLED

The handshake drops because the default buffer isn’t matching the v2.5.0 validation sequence. You’ll need to bump the TIMEOUT_MS past the 30-second mark and force the API_INTEGRATION_MODE to STRICT so the edge doesn’t bail out early. The 60-second doc value is actually a soft limit, not a hard handshake ceiling. Setting RETRY_COUNT to 2 handles the initial SSL_ERROR_HANDSHAKE_FAILURE spike without throwing a 403. It’s a known quirk with the us-west-2 route tables right now.

Push that payload through the BYOC Edge provisioning endpoint instead of relying on the console defaults. The API handles the certificate chain verification much faster than the UI wizard. You’ll see the handshake complete cleanly once the TIMEOUT_MS aligns with the actual network latency. Keep an eye on the MTLS_CERT_PATH rotation schedule too. The stack usually flips to RUNNING within a few minutes after the config patch lands. Nothing else needs adjusting on the load balancer side.

3

The handshake abort stems from a misaligned CertificateChainValidation directive within the EdgeServiceProfile, not a buffer timeout. Defaults fail here. The Admin UI enforces strict CertificateAuthorityBinding that the YAML override bypasses, causing the edge to drop the connection during CN verification. You’ll need to reconfigure the TrustedAuthorityStore reference directly in the Edge Configuration settings to ensure the RootCertificate matches the BYOC endpoint. Relying on timeout extensions masks the underlying validation failure. The platform requires explicit mapping of the IntermediateCertificateAuthority before the handshake proceeds. Check the QueueRoutingConfiguration for any conflicting EdgeAssignmentRules that might force a legacy validation path. You’ll also want to verify the NetworkInterfaceBinding in the Admin UI matches the v2.5.0 spec. The 30-second drop indicates the SSL layer rejects the CN immediately. The EdgeHealthMonitor will show a RED status until the CertificateRevocationList is synchronized. Ensure the OrganizationByocSettings reflect the correct EdgeClusterRegion. Misalignment in the ServiceProfileOverrides often triggers this specific reset behavior. The Admin UI dashboard provides a visual validation step that catches these mismatches before deployment. You’ll save time by auditing the EdgeTemplateVersion bindings. Apply the update via the API to force the correct profile binding.

PUT /api/v2/organizations/byoc/edges/{edgeId}
{
 "edgeServiceProfile": {
 "certificateChainValidation": "STRICT",
 "trustedAuthorityStoreId": "valid-store-id",
 "rootCertificateBinding": "BYOC_ENDPOINT_MATCH",
 "intermediateCertificateAuthority": "REQUIRED"
 }
}
4

terraform-provider-cxascode handles the BYOC edge config by locking the handshake to 30 seconds unless you explicitly pass the mtls_handshake_timeout attribute, so you’ll just need to bump that value in your resource block. The SDK wrapper ignores the YAML override if the HCL doesn’t match, which triggers that SSL_ERROR_HANDSHAKE_FAILURE instantly.

resource "genesyscloud_byoc_edge" "byoc_edge" {
 mtls_handshake_timeout = 65000
}

It’s a nasty gotcha in the provider logic.

5

Are you routing the handshake through a reverse proxy or hitting the edge directly? The genesyscloud-python SDK handles certificate pinning differently when the mtls_handshake_timeout exceeds thirty seconds, which usually triggers that SSL_ERROR_HANDSHAKE_FAILURE before the buffer even fills. You’ll want to check the verify_ssl parameter in the client initialization. Bumping the timeout in Terraform alone won’t save you if the Python session defaults to strict validation. The SDK drops the connection hard when the root CA chain doesn’t match the internal trust store, so the YAML override gets ignored entirely. Run this configuration check before pushing the edge update. The v2.5.0 patch changes how the platform validates the intermediate certs, and it’s messy if you miss the trust store binding.

from genesyscloud.platform_client import PlatformClient
from genesyscloud.byoc_edge import ByocEdgeApi

client = PlatformClient.create()
client.configuration.verify_ssl = False
client.configuration.timeout = 65000
byoc_api = ByocEdgeApi(client)
# Force explicit CA bundle path if using v2.5.0
client.configuration.cert_file = "/opt/certs/byoc_root.pem"