iPhone and Exchange ActiveSync: Router Timeout - cracked it?

The Draytek Vigor 2910 has now had its firmware upgraded to the latest version.


The portmaptime function is now available.  Running 'portmaptime -l' to list the timeout values shows TCP SYN as 60 seconds... well below the recommended 540 seconds for ActiveSync.


I have set it, according to some users, to 900:  'portmaptime -s 900' (s for 'tcp Syn')


The iPhone user reports that whatever change I made, appears to have cracked it... I told him I'm going to wait a couple of weeks before I start celebrating... :)