The HTTPS protocol is a standard security technology used to establish an encrypted link between a web server and a web client. HTTPS facilitates secure network communication by identifying and authenticating the server as well as ensuring the privacy and integrity of all transmitted data. Since HTTPS prevents eavesdropping on or tampering with information sent over the network, it should be used with any login or authentication mechanism and on any network where communication contains confidential or proprietary information.
The use of HTTPS ensures that names, passwords, and other sensitive information cannot be deciphered as they are sent between ArcGIS Web Adaptor and the server. When you use HTTPS, you connect to your web pages and resources using the HTTPS protocol instead of HTTP.
To use HTTPS, you need to obtain a server certificate and bind it to the website that hosts ArcGIS Web Adaptor. Each web server has its own procedure for loading a certificate and binding it to a website.
Ensure also that your web server is set to ignore client certificates in order to correctly access secure services over HTTPS.
Create a server certificate
To be able to create an HTTPS connection between ArcGIS Web Adaptor and your server, the web server requires a server certificate. A certificate is a digital file that contains information about the identity of the web server. It also contains the encryption technique to use when establishing a secure channel between the web server and ArcGIS Server. A certificate must be created by the owner of the website and digitally signed. There are three types of certificates, CA-signed, domain, and self-signed, which are explained below.
Certificate authority (CA) signed certificates should be used for production systems, particularly if your deployment of ArcGIS Server is going to be accessed from users outside your organization. For example, if your server is not behind your firewall and is accessible over the internet, using a CA-signed certificate assures clients from outside your organization that the identity of the website has been verified.
In addition to being signed by the owner of the website, a certificate can be signed by an independent CA. A CA is usually a trusted third party that can attest to the authenticity of a website. If a website is trustworthy, the CA adds its own digital signature to that website's self-signed certificate. This assures web clients that the website's identity has been verified.
When using a certificate issued by a well-known CA, secure communication between the server and the web client occurs automatically with no special action required by the user. There is no unexpected behavior or warning message displayed in the web browser, since the website has been verified by the CA.
If your server is located behind your firewall and using a CA-signed certificate is not possible, using a domain certificate is an acceptable solution. A domain certificate is an internal certificate signed by your organization's certificate authority. Using a domain certificate helps you reduce the cost of issuing certificates and eases certificate deployment, since certificates can be generated quickly within your organization for trusted internal use.
Users within your domain will not experience any of the unexpected behavior or warning messages normally associated with a self-signed certificate, since the website has been verified by the domain certificate. However, domain certificates are not validated by an external CA, which means users visiting your site from outside your domain will not be able verify that your certificate represents the party it claims to represent. External users will see browser warnings about the site being untrusted, which may lead them to think that they are communicating with a malicious party and be turned away from your site.
Create a domain certificate and enable HTTPS
Successful completion of the ArcGIS Enterprise configuration wizard requires HTTPS to be enabled in IIS on the machine where the base deployment is installed.
If HTTPS is not enabled, the configuration wizard does not complete and reports the following error message:
The Web Adaptor URL https://mymachine.mydomain.com/server cannot be reached. Please check that HTTPS has been enabled for your web server. For instructions on enabling HTTPS, navigate to the Help Topic: Introducing ArcGIS Enterprise > ArcGIS Enterprise Builder > Plan a base deployment.
In most cases, your IT administrator will give you certificates and bind them to HTTPS port 443.
In 2017, Chrome began only trusting certificates with a Subject Alternative Name (SAN) parameter, which cannot be configured when creating a certificate in the IIS Manager application.
If you are using IIS and need to create a domain certificate, see Create a domain certificate, which provides a script to run on your machine that will create the appropriate certificate and bind it to HTTPS port 443.
A certificate signed only by the owner of the website is called a self-signed certificate. Self-signed certificates are commonly used on websites that are only available to users on the organization's internal (LAN) network. If you communicate with a website outside your own network that uses a self-signed certificate, you have no way to verify that the site issuing the certificate represents the party it claims to represent. You may be communicating with a malicious party, putting your information at risk.
If you use a self-signed certificate, expect to see web browser and ArcGIS Pro warnings about the site being untrusted. When a web browser encounters a self-signed certificate, it will typically display a warning and ask you to confirm that you want to proceed to the site. Many browsers display warning icons or a red color in the address bar as long as you are using the self-signed certificate.
Create a self-signed certificate in IIS
In IIS Manager, do the following to create a self-signed certificate:
- In the Connections pane, select your server in the tree view and double-click Server Certificates.
- In the Actions pane, click Create Self-Signed Certificate.
- Enter a user-friendly name for the new certificate and click OK.
The final step is for you to bind the self-signed certificate to HTTPS port 443. See Binding the certificate to the website below for instructions.
Bind the certificate to the website
If you obtained a certificate that is not already bound to the website hosting ArcGIS Web Adaptor, you'll need to do so before continuing. Binding refers to the process of configuring the certificate to use port 443 on the website.
The script in the Create a domain certificate topic will bind your certificate for you.
The instructions for binding a certificate with the website vary depending on the platform and version of your web server. For instructions, consult your system administrator or your web server's documentation. For example, the steps for binding a certificate in IIS are below.
Bind a certificate to port 443 in IIS
In IIS Manager, do the following to bind a certificate to HTTPS port 443:
- Select your site in the tree view, and in the Actions pane, click Bindings.
- If port 443 is not available in the Bindings list, click Add. From the Type drop-down list, select https. Leave the port at 443.
- If port 443 is listed, select the port from the list and click Edit.
- From the certificate drop-down list, select your certificate name and click OK.
Test your site
After binding the certificate to the website, you can configure your Web Adaptor for use with the server. You will need to access the ArcGIS Web Adaptor configuration page using an HTTPS URL such as https://webadaptorhost.domain.com/webadaptorname/webadaptor.
After you've configured your Web Adaptor, you should test that HTTPS is working properly by making an HTTPS request to ArcGIS Server Manager, for example, https://webadaptorhost.domain.com/webadaptorname/manager.