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Problem
InformaCast is in use and UPLINX Phone Control Tool does not show the screenshot of the phone's display but "Cisco Error #4" is shown. Error #4 means that the phone is unable to authenticate the request to the phone's URL at http(s)://<IP of phone>/CGI/Screenshot as per Check Phone Screenshot in Web Browser.
Is InformaCast in use?
To check if InformaCast is in use, check if the (secure) Authentication URL in CUCM's Enterprise Parameters is redirected to
http://<InformaCast server>:8081/InformaCast/phone/auth
Please also check within the CUCM phone's config that the Authentication URL has not been overwritten on a per phone level.
Note: The default CUCM Authentication URL is http://<CUCM IP>:8080/ccmcip/authenticate.jsp
On a phone, the effective used Authentication URL can be seen when browsing to the IP address of the phone and select the menu "Network Setup". Check the Authentication URL points to CUCM or to Informacast.
Solution
Log into InformaCast by browsing to https://<<InformaCast server>:>:8444/InformaCast/admin, then choose the menu Admin > Telephony > Cisco Unified Communications Manager Cluster as per screenshot below.
Check the following entry:
If empty, non-InformaCast authentication requests from phones in this cluster will be sent to the default Unified Communications Manager authentication page, http://<IP>/ccmcip/authenticate.jsp
If this is not correct, complete the following field like so: Next Authentication URL: http://<IP of CUCM publisher>/ccmcip/authenticate.jsp
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