CPM screen shrinks when exposed in IAC with a short URL
A specific page on the Customer Process Manager (CPM) portal shrinks when using host name as "xxx-xx-xxxxx" instead of "xxx-xx-xx.your_domain.com" to log in to PRPC. This problem does not occur when the log-in uses the full host name.
Steps to Reproduce
Create a Remote Case through CPM.
An issue in the custom application code or rules
The IAC Gateway URL was set to use the full host name "xxx-xx-xx.your_domain.com" and not the short host name. To avoid violating the browser same origin policy, the same URL used by the IAC Gateway should be used to access PRPC.
Ensure that the URLs presented at runtime and in the browser for the web application page match the one specified as part of the IAC Gateway URL. This includes the protocol, full host name (as in this case), domain name, and port number.
See the PDN Article, Setting the gatewayURL configuration parameter, https://pdn.pega.com/node/1282.