When establishing trust IPA might report following error message:

[root@host ~]# ipa trust-add ipaqe.com --type=ad --admin administrator --password
Active directory domain administrator's password:
ipa: ERROR: CIFS server communication error: code "-1073741811",
                message "Unexpected information received" (both may be "None")

The error code -1073741811 is NT_STATUS_INVALID_PARAMETER. What happens is that Samba library that we use tries to establish an authenticated connection to the AD DC using Kerberos credentials of the AD administrator and that fails due to Kerberos-related issue.

In most cases the actual issue is clock skew, so it would be good to suggest to check time difference between AD and IPA.