After upgraded to Safari 12, Citrix Workspace App and Citrix Receiver do not start *.ica files any more.
To correct this problem, you need to change the web.config on all Storefront servers.
Solution:
For StoreFront deployments, modify web.config under the Receiver for Web (RfWeb) site (typically C:\inetpub\wwwroot\Citrix\StoreWeb) to activate the Citrix Receiver Launcher / Citrix Workspace App Launcher for Safari 12 and later.
1. Open web.config using your preferred text editor and locate the line : <protocolHandler enabled=”true” platforms=”(Macintosh|Windows NT).*((Firefox/((5[2-9]|[6789][0-9])|\d\d\d))|(Chrome/((4[2-9]|[56789][0-9])|\d\d\d)))” skipDoubleHopCheckWhenDisabled=”false” />
2. The value of the platforms attribute is a regular expression specifying the browsers that Citrix Receiver Launcher is used for client detection and HDX launches. Change the regular expression to:
“(Macintosh|Windows NT).*((Firefox/((5[2-9]|[6789][0-9])|\d\d\d))|(Chrome/((4[2-9]|[56789][0-9])|\d\d\d)))|Macintosh.*Version/(1[2-9]|[2-9][0-9]).*Safari/“
3. This will add Safari 12 and later to the list of browsers that Citrix Receiver Launcher will be used.
Source: CTX238286