Hi,
the getfedora.org issue is related to the fast-flux anomaly detection indeed.
Searching your logs, you will probably find entries like these:
Feb 18 11:11:53 squid-asnbl-helper[3133] WARN: Destination 'getfedora.org' exceeds ASN diversity threshold (9 > 5), possibly Fast Flux: [81, 3701, 15456, 16509, 21785, 22753, 36850, 54455, 61317]
Feb 18 11:11:53 squid-asnbl-helper[3133] INFO: Denying access to possible Fast Flux destination 'getfedora.org'
Please refer to this post for information on how to get around that, without having to disable the fast-flux detection completely.
I cannot reproduce any issues with wiki.ipfire.org. Are there any error or log messages for this destination? If so, could you please post them here?
Thanks, and best regards,
Peter Müller