Prerequisites for installing

System requirements and compatibility

Device requirements

  • Citrix Workspace app version 1808 or later for iOS supports iOS 10, 11, and 12.
  • Citrix Workspace app version 1909 or later for iOS supports iOS 13 and iPadOS.
  • This software update has been validated on the following devices:
    • iPhone 5x models, iPhone 6x models, iPhone 7x models, iPhone 8x models, and only iPhone X model.
    • All iPad models (including iPad Pro) except for iPad 1 and iPad 2 which are not supported.
  • External display support
    • iPhone - as supported by iOS.
    • iPad - as supported by iOS (does not use the whole screen).

Server requirements

Ensure you install all the latest hotfixes for your servers.

  • For connections to virtual desktops and apps, Citrix Workspace app for iOS supports Citrix StoreFront and Web Interface.

    StoreFront:

    • StoreFront 3.6 or later (recommended). Citrix Workspace app for iOS has been validated with the latest version of StoreFront; previous supported versions include StoreFront 2.6 or later.

      Provides direct access to StoreFront stores. Citrix Workspace app for iOS also supports prior versions of StoreFront.

      Note:

      With XenApp and XenDesktop 7.8, Citrix introduced support for the Framehawk virtual channel and 3D Pro. This functionality was extended to Citrix Workspace app for iOS.

    • StoreFront configured with a Workspace for Web site

      Provides access to StoreFront stores from a Safari web browser. Users must manually open the ICA file using the browser. For the limitations of this deployment, see the StoreFront documentation.

    Web Interface:

    • Web Interface 5.4 with Web Interface sites

    • Web Interface 5.4 with XenApp Services sites

    • Web Interface on Citrix Gateway (browser-based access only using Safari)

      You must enable the rewrite policies provided by Citrix Gateway.

  • Citrix Virtual Apps and Desktops, XenApp, and XenDesktop (any of the following products):

    • Citrix Virtual Apps and Desktops 7 1808 or later
    • Citrix XenDesktop 7.x or later
    • Citrix XenApp 7.5 or later
    • Citrix XenApp 6.5 for Windows Server 2008 R2

Connections, certificates, and authentication

For connections to StoreFront, Citrix Workspace app for iOS supports the following authentication methods:

  Workspace for Web using browsers StoreFront Services site (native) StoreFront XenApp Services site (native) Citrix Gateway to Workspace for Web (browser) Citrix Gateway to StoreFront Services site (native)
Anonymous Yes Yes      
Domain Yes Yes Yes Yes* Yes*
Domain pass-through Yes Yes Yes    
Security token       Yes* Yes*
Two-factor authentication (domain with security token)       Yes* Yes*
SMS       Yes* No
Smart card   Yes   Yes* Yes*
User certificate       Yes (Citrix Gateway plug-in) Yes (Citrix Gateway plug-in)

*Available only for Workspace for Web sites and for deployments that include Citrix Gateway, with or without installing the associated plug-in on the device.

For connections to the Web Interface 5.4, Citrix Workspace app for iOS supports the following authentication methods:

Note:

Web Interface uses the term Explicit to represent domain and security token authentication.

  Web Interface (browsers) Web Interface XenApp Services site Citrix Gateway to Web Interface (browser) Citrix Gateway to Web Interface XenApp Services site
Anonymous Yes      
Domain Yes Yes Yes*  
Domain pass-through Yes      
Security token     Yes*  
Two-factor authentication (domain with security token)     Yes*  
SMS     Yes*  
Smart card        
User certificate     Yes (Require Citrix Gateway plug-in)  

Certificates

Private (self-signed) certificates

When a private certificate is installed on the remote gateway, the root certificate for the organization’s certificate authority must be installed on the device to successfully access Citrix resources using Citrix Workspace app for iOS.

Note:

If the remote gateway’s certificate cannot be verified upon connection (because the root certificate is not included in the local keystore), an untrusted certificate warning appears. If a user chooses to continue through the warning, a list of applications is displayed; however, applications fail to start.

Manually installed certificate

In iOS 10.3 and later, a certificate included in a profile that you install manually is not automatically trusted for SSL. To trust manually installed certificate profiles in iOS:

  1. Make sure you have installed the certificate profile on the device.
  2. Go to Settings > General > About > Certificate Trust Settings.

    Each root that has been installed through a profile appears under Enable Full Trust For Root Certificates.

  3. You can toggle trust on or off for each root.

Import root certificates on iPad and iPhone devices

Obtain the root certificate of the certificate issuer and email it to an email account configured on your device. When clicking the attachment, you are asked to import the root certificate.

Wildcard certificates

Wildcard certificates are used in place of individual server certificates for any server within the same domain. Citrix Workspace app for iOS supports wildcard certificates.

Intermediate certificates and Citrix Gateway

When your certificate chain includes an intermediate certificate, the intermediate certificate must be appended to the Citrix Gateway (or Access Gateway) server certificate. Also, for Access Gateway installations, see the Knowledge Base article that matches your edition:

CTX114146: How to Install an Intermediate Certificate on Access Gateway Enterprise Edition

RSA SecurID authentication is supported for Secure Gateway configurations (through the Web Interface only) and all supported Access Gateway configurations.

Citrix Workspace app for iOS supports all authentication methods supported by Access Gateway.

Joint Server Certificate Validation Policy

Releases of Citrix Workspace app for iOS have a stricter validation policy for server certificates.

Important

Before installing Citrix Workspace app for iOS, confirm that the certificates at the server or gateway are correctly configured as described here. Connections may fail if:

  • the server or gateway configuration includes a wrong root certificate
  • the server or gateway configuration does not include all intermediate certificates
  • the server or gateway configuration includes an expired or otherwise invalid intermediate certificate
  • the server or gateway configuration includes a cross-signed intermediate certificate

When validating a server certificate, Citrix Workspace app for iOS now uses all the certificates supplied by the server (or gateway) when validating the server certificate. As in previous releases, Citrix Workspace app for iOS then also checks that the certificates are trusted. If the certificates are not all trusted, the connection fails.

This policy is stricter than the certificate policy in web browsers. Many web browsers include a large set of root certificates that they trust.

The server (or gateway) must be configured with the correct set of certificates. An incorrect set of certificates might cause Citrix Workspace app for iOS connections to fail.

Suppose a gateway is configured with these valid certificates. This configuration is recommended for customers who require stricter validation, by determining exactly which root certificate is used by Citrix Workspace app for iOS:

  • “Example Server Certificate”
  • “Example Intermediate Certificate”
  • “Example Root Certificate”

Then, Citrix Workspace app for iOS will check that all these certificates are valid. Citrix Workspace app for iOS will also check that it already trusts “Example Root Certificate”. If Citrix Workspace app for iOS does not trust “Example Root Certificate”, the connection fails.

Important

Some certificate authorities have more than one root certificate. If you require this stricter validation, make sure that your configuration uses the appropriate root certificate. For example, there are currently two certificates (“DigiCert”/”GTE CyberTrust Global Root”, and “DigiCert Baltimore Root”/”Baltimore CyberTrust Root”) that can validate the same server certificates. On some user devices, both root certificates are available. On other devices, only one is available (“DigiCert Baltimore Root”/”Baltimore CyberTrust Root”). If you configure “GTE CyberTrust Global Root” at the gateway, Citrix Workspace app for iOS connections on those user devices will fail. Consult the certificate authority’s documentation to determine which root certificate should be used. Also note that root certificates eventually expire, as do all certificates.

Then, Citrix Workspace app for iOS will use these two certificates. It will then search for a root certificate on the user device. If it finds one that validates correctly, and is also trusted (such as “Example Root Certificate”), the connection succeeds. Otherwise, the connection fails. Note that this configuration supplies the intermediate certificate that Citrix Workspace app for iOS needs, but also allows Citrix Workspace app for iOS to choose any valid, trusted, root certificate.

Now suppose a gateway is configured with these certificates:

  • “Example Server Certificate”
  • “Example Intermediate Certificate”
  • “Wrong Root Certificate”

A web browser may ignore the wrong root certificate. However, Citrix Workspace app for iOS will not ignore the wrong root certificate, and the connection will fail.

Some certificate authorities use more than one intermediate certificate. In this case, the gateway is normally configured with all the intermediate certificates (but not the root certificate) such as:

  • “Example Server Certificate”
  • “Example Intermediate Certificate 1”
  • “Example Intermediate Certificate 2”

Important

Some certificate authorities use a cross-signed intermediate certificate. This is intended for situations there is more than one root certificate, and a earlier root certificate is still in use at the same time as a later root certificate. In this case, there will be at least two intermediate certificates. For example, the earlier root certificate “Class 3 Public Primary Certification Authority” has the corresponding cross-signed intermediate certificate “VeriSign Class 3 Public Primary Certification Authority - G5”. However, a corresponding later root certificate “VeriSign Class 3 Public Primary Certification Authority - G5” is also available, which replaces “Class 3 Public Primary Certification Authority”. The later root certificate does not use a cross-signed intermediate certificate.

Note

The cross-signed intermediate certificate and the root certificate have the same Subject name (Issued To), but the cross-signed intermediate certificate has a different Issuer name (Issued By). This distinguishes the cross-signed intermediate certificate from an ordinary intermediate certificate (such “Example Intermediate Certificate 2”).

This configuration, omitting the root certificate and the cross-signed intermediate certificate, is normally recommended:

  • “Example Server Certificate”
  • “Example Intermediate Certificate”

Avoid configuring the gateway to use the cross-signed intermediate certificate, as Citrix Workspace app for iOS will select the earlier root certificate:

  • “Example Server Certificate”
  • “Example Intermediate Certificate”
  • “Example Cross-signed Intermediate Certificate” [not recommended]

It is not recommended to configure the gateway with only the server certificate:

  • “Example Server Certificate”

In this case, if Citrix Workspace app for iOS cannot locate all the intermediate certificates, the connection will fail.