AP15 - device sends DEV2ASG_INITIALCONTACT twice, dropping

Good Morning,

I opened a case in Sophos Ltd myutm - but there seams no reaction. We have "premium" support with a UTM 110.

An Ap15 is allways inactive.

The logs:

2016:05:18-08:14:45 astaro-cx awed_10245_: _MASTER_ new connection from 192.168.131.107:33593
2016:05:18-08:14:45 astaro-cx awed_17728_: _A40031D269797B2_ AP15 from 192.168.131.107:33593 identified as A40031D269797B2
2016:05:18-08:14:45 astaro-cx awed_17728_: _A40031D269797B2_ _Re-_loaded identity and/or configuration
2016:05:18-08:14:45 astaro-cx awed_17728_: _A40031D269797B2_ device sends DEV2ASG_INITIALCONTACT twice, dropping.
2016:05:18-08:14:50 astaro-cx awed_10245_: _MASTER_ new connection from 192.168.131.107:33594
2016:05:18-08:14:50 astaro-cx awed_17743_: _A40031D269797B2_ AP15 from 192.168.131.107:33594 identified as A40031D269797B2
2016:05:18-08:14:50 astaro-cx awed_17743_: _A40031D269797B2_ _Re-_loaded identity and/or configuration
2016:05:18-08:14:50 astaro-cx awed_17743_: _A40031D269797B2_ device sends DEV2ASG_INITIALCONTACT twice, dropping.
2016:05:18-08:14:55 astaro-cx awed_10245_: _MASTER_ new connection from 192.168.131.107:33595
2016:05:18-08:14:55 astaro-cx awed_17756_: _A40031D269797B2_ AP15 from 192.168.131.107:33595 identified as A40031D269797B2
2016:05:18-08:14:55 astaro-cx awed_17756_: _A40031D269797B2_ _Re-_loaded identity and/or configuration
2016:05:18-08:14:55 astaro-cx awed_17756_: _A40031D269797B2_ device sends DEV2ASG_INITIALCONTACT twice, dropping.

One AP15 was replaced - but the now box shows the same error. With the first AP15 a Sophos Technican klicked a while in the web Interface - but the error still persists.

We use the latest 9.4 but there error was at latest 9.3 too.

Any ideas?

best regards