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# Security and Network Settings

Our goal is to provide a secure environment to our customers, and we are continuously monitoring and improving our architecture and processes. In this section, we will review the security features and the required network settings to operate Gurobi Instant Cloud.

## Accessing the Cloud Manager

The Cloud Manager is designed to streamline the control of the Gurobi Optimizer on the Cloud. With the Cloud Manager, Gurobi manages AWS EC2 or Azure instances. The Cloud Manager consists of the website cloud.gurobi.com and a REST APIs. The main functions of the Cloud Manager are about configuring, controlling and monitoring Gurobi compute servers. No optimization model data is communicated with the Cloud Manager.

When accessing the website, users must be authenticated with their Gurobi accounts. When using the REST API, the clients are authenticated with the API key and API secret related to a user account. The communication is secure using the HTTPS protocol (minimum of TLS 1.2) and the Cloud Manager database is encrypted at rest. Access to cloud.gurobi.com is also protected by a Web Application Firewall. For security purposes, Gurobi records and monitors the metadata of HTTPS communication.

For better availability and scalability, the Cloud Manager is hosted in different regions of the world. The clients will be routed to the most appropriate available server using a latency based routing. Each region may also provide several instances of the servers. Clients should not hardcode IP addresses to access the Cloud Manager, and should always make sure to use the latest DNS resolution.

The Gurobi client (gurobi_cl, grbtune, Gurobi library…) will first connect to the Cloud Manager using the secure REST API to check the pool status and launch the compute servers as necessary. In order to enable this connection, the client firewalls must be configured to open the standard HTTPS port 443 to host cloud.gurobi.com.

## Accessing the Compute Servers

When a Compute Server is started, you get a new EC2 or Azure virtual machine that is not shared with any other Gurobi customers, it is always dedicated. Access to each machine is authenticated with API keys and secured with end-to-end encryption. Machine disks are also encrypted. When the machine is terminated, all optimization data are discarded from memory and disk.

Once the compute server has been launched, optimization commands are exchanged between the client and the server. The communication is secure using end-to-end encryption with HTTPS (minimum of TLS 1.2). The region router consists of a load balancer and a region router. The region router is a reverse proxy that will forward the communication to the appropriate compute server within the Gurobi private virtual network. The load balancer, the region routers and the compute servers all use encrypted HTTPS communication.

The started machines are not accessible directly and passing through the region router is enforced. The diagram below summarizes the architecture with AWS.

As shown below, each region provides a different URL address to its router. Clients should not hardcode IP addresses to access the region routers, and should always make sure to use the latest DNS resolution. In order to enable this connection, the client firewalls must be configured to open the standard HTTPS port 443 to the following hosts depending on the region.

Provider | Region | Router
--- | --- | ---
AWS | us-east-1 | https://compute-us-east-1.gurobi.com
AWS | us-west-1 | https://compute-us-west-1.gurobi.com
AWS | eu-central-1 | https://compute-eu-central-1.gurobi.com
AWS | ap-northeast-1 | https://compute-ap-northeast-1.gurobi.com
AWS | ap-southeast-2 | https://compute-ap-southeast-2.gurobi.com
Azure | eastus | https://compute-eastus-azure.gurobi.com
Azure | westus2 | https://compute-westus2-azure.gurobi.com
Azure | westeurope | https://compute-westeurope-azure.gurobi.com

## Managing API keys

The Cloud Manager website is the only place where the API keys can be generated. Multiple API keys can be generated so that keys can be replaced in case one of them has been compromised. Each key is owned by a user. Before disabling a user by contacting the Gurobi support or before deleting an API key, please make sure that you have migrated your applications to new API keys.

## Proxies

The architecture is compatible with standard proxy settings using environment variables HTTP_PROXY and HTTPS_PROXY. HTTPS_PROXY takes precedence over HTTP_PROXY for https requests. The values may be either a complete URL or a “host[:port]”, in which case the “http” scheme is assumed.

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