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We take Security seriously at ConnexCS, emphasizing the industry's best practices in all our policies and procedures. We use proven technology and the latest ideas to keep your systems safe from threats both external and internal.

Below, we have compiled a top-level abstract list on how we secure our systems. The document is kept brief in to limit exposure to our underlying systems in a public forum, but feel free to contact us with specific questions.

SSL Certificates

Our HTTPS traffic uses short-lived SHA256bit certificates with 2048bit keys, rejecting downgrade attacks like SSL2,3. We use HSTS, Perfect Forward Secrecy, and OCSP Stapling. You are welcome to see our servers SSL test results here.

Inter-zone Communication

All internal traffic travelling between zones traverses our mesh VPN, protected by 4096-bit keys and managed by internal CA Servers.


Our system uses an exponentially increasing delay on failed attempts and centralised reporting.


All passwords are hashed in our system. The ones required for HTTP login are encrypted by Argon2, the winner of the Password Hashing Competition (PHC).

On every hash we use: - Random Per Password Salt (With email hashed seasoning) - Off-database site-pepper - High Time, Memory Cost, Parallelism Cost


All admins are required to use two-factor authentication when signing into the system. Two-Factor Authentication is also available for any user accounts using RFC 6238-style TOTP (Time Based One-time Passwords), using applications such as Google Authenticator or Microsoft Authenticator.

Server Keys

Any user with direct access to any servers is required to use SSH Keys. In all systems where keys are not possible, long multi-symbol passwords are used.


We do not consider the following items insecure. We completely understand the consequences of enabling these systems, but we believe their benefits outweigh the security implications.

This does not mean we don't monitor activity on either of these, nor does it mean that we don't have automatically reactive systems to ensure uptime in the event of an attack.

ICMP Pings

ICMP (Internet Control Message Protocol) pings messages (e.g ping ICMP Ping attacks were once common, related to the packet size versus available bandwidth. They still happen, but it is more useful to enable ICMP replies to correctly establish the status of a server.

SIP / RTP Firewall Block on Default.

Our SIP Servers only run SIP, and nothing else. Our RTP Servers run RTP, and nothing else. 5060 is not firewalled, nor are any of our RTP Ports on our RTP Servers.

This means that you will most likely see unauthorized traffic hitting your switch, but you will also see unauthorized calls being blocked for failing authentication. This is normal, as it is still important to see failed traffic to make sure the authentication isn't blocking authorized callers.


We have application-level logic that identifies malicious activity, which will escalate issues to our IDS systems, which will enforce feedback firewall rules in return.

Data Usage

Connex Carrier Services Worldwide, LTD is an independent company. All data is retained on ConnexCS servers, and never passed to third parties. All staff are required to abide by non-disclosure policies that protect user data, and it is made clear any data breach would be treated with severity.

SSL Certificates

The SSL certificate can be deployed on your customer portal with a single click.

  1. Click Setup > Integrations.
  2. Click Domains.
  3. Click Deploy Certificate.

User Enhanced Security

In addition to the above ConnexCS security, we also recommend the following practices to harden your ConnexCS account.

  1. Passwords (we recommend following the NIST guidelines):
    • 8 character minimum when a human sets it
    • 6 character minimum when set by a system/service
    • Support at least 64 characters maximum length
    • All ASCII characters (including space) should be supported
    • Truncation of the secret (password) shall not be performed when processed
    • Check chosen password with known password dictionaries
    • Allow at least 10 password attempts before lockout
    • No complexity requirements
    • No password expiration period
    • No password hints
    • No knowledge-based authentication (e.g. who was your best friend in high school?)
    • No SMS for 2FA (use a one-time password from an app like Google Authenticator)
  2. Hardware Security Tokens: Yubikey is an example of hardware security token which can never be digitaly stolen can be used for logins to ConnexCS.

  3. Duo Security or Google/Microsoft Authenticator: As per the NIST recommendations above SMS should not be trusted for second factor authentication. We implement both Duo Security and Time-based One-time Password Algorithm (TOTP; specified in RFC 6238), which can be used by Google Authenticator or Microsoft Authenticator.