Sinch Scheduled Maintenance - Security Enhancement - US3 Site
Scheduled for Dec 7, 09:00 - 10:00 UTC
Scheduled
Dear Client,

We are disabling TLS1.0 and TLS1.1 cipher suites from the TLS-enabled API access gateways in EU3 below.

Type: Scheduled Maintenance
Start Time: 2021-12-07 09:00 UTC
End Time: 2021-12-07 10:00 UTC
Affected site: US3
SMPP FQDN: smpp-us3.clxcommunications.com / us3.smpp.api.sinch.com / inbound01-ash1.clxnetworks.com (209.95.131.8) port 3601
HTTP FQDN: http-us3.clxcommunications.com / us3.httpsms.api.sinch.com / inbound01-ash1.clxnetworks.com (209.95.131.8) port 3801
ENUM FQDN: http-us3.clxcommunications.com / us3.httplookup.api.sinch.com / inbound01-ash1.clxnetworks.com (209.95.131.8) port 3701

Impact: For clients connecting to the TLS-enabled API access gateway and port combinations above using the below TLS ciphers as the following TLS version and cipher suite combinations will be disabled.

TLSv1, ECDHE-RSA-AES256-SHA
TLSv1, DHE-RSA-AES256-SHA
TLSv1, AES256-SHA
TLSv1, ECDHE-RSA-AES128-SHA
TLSv1, DHE-RSA-AES128-SHA
TLSv1, AES128-SHA
TLSv1, ECDHE-RSA-DES-CBC3-SHA
TLSv1, EDH-RSA-DES-CBC3-SHA
TLSv1, DES-CBC3-SHA
TLSv1.1, ECDHE-RSA-AES256-SHA
TLSv1.1, DHE-RSA-AES256-SHA
TLSv1.1, AES256-SHA
TLSv1.1, ECDHE-RSA-AES128-SHA
TLSv1.1, DHE-RSA-AES128-SHA
TLSv1.1, AES128-SHA
TLSv1.1, ECDHE-RSA-DES-CBC3-SHA
TLSv1.1, EDH-RSA-DES-CBC3-SHA
TLSv1.1, DES-CBC3-SHA
TLSv1.2, ECDHE-RSA-AES256-SHA384
TLSv1.2, ECDHE-RSA-AES256-SHA
TLSv1.2, DHE-RSA-AES256-SHA
TLSv1.2, AES256-GCM-SHA384
TLSv1.2, AES256-SHA256
TLSv1.2, AES256-SHA
TLSv1.2, ECDHE-RSA-AES128-GCM-SHA256
TLSv1.2, ECDHE-RSA-AES128-SHA256
TLSv1.2, ECDHE-RSA-AES128-SHA
TLSv1.2, DHE-RSA-AES128-GCM-SHA256
TLSv1.2, DHE-RSA-AES128-SHA
TLSv1.2, AES128-GCM-SHA256
TLSv1.2, AES128-SHA256
TLSv1.2, AES128-SHA
TLSv1.2, ECDHE-RSA-DES-CBC3-SHA
TLSv1.2, EDH-RSA-DES-CBC3-SHA
TLSv1.2, DES-CBC3-SHA

There will be no impact and no action is required if your TLS client currently support any of the stronger cipher suites below when connecting to the TLS-enabled API access gateway and port combinations above.

TLSv1.2, ECDHE-ECDSA-AES256-GCM-SHA384
TLSv1.2, ECDHE-RSA-AES256-GCM-SHA384
TLSv1.2, DHE-RSA-AES256-GCM-SHA384

In case you need further information, please contact technical support at support@sinch.com.

Sincerely,

Sinch
Posted Nov 08, 2021 - 10:48 UTC
This scheduled maintenance affects: Messaging API - US (SMPP, HTTP) and Lookup API Endpoints (HTTP US).