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WAF Exchange 2010 ActiveSync No signature found

I'm trying to set up WAF for an Exchange 2010 ActiveSync site. I've selected the "Exchange General" firewall profile, modified only to Monitor rather than Reject evil traffic.

I keep getting log entries like:

2017:06:28-10:09:42 myutm httpd[29979]: [url_hardening:error] [pid 29979:tid 4037872496] [client <users_ip>:60725] No signature found, URI: https://<my_domain>/Microsoft-Server-ActiveSync?User=<some__user>&DeviceId=<long_device_id>&DeviceType=iPhone&Cmd=Sync

even though /Microsoft-Server-ActiveSync is in the Entry URL list (it's there as a preset, along with all the other Exchange paths like OWA etc.). I have even tried re-adding this by adding it from the log text using copy/paste, but it says "list entry already exists"

Any suggestions would be very welcome! 

 



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