Pure Message not updating - "Could Not Contact Server"

for a week now whenever Sophos UPdate runs on our Exchange Server everythign works as expected except for the updates to PM. Started about the time I disabled SMB1 on the server (for other reasons!!) but have changed that back, both the EM server and the Exchange server have been updated/patched and restarted.

Anyone have any ideas?

Time: 22/05/2017 15:31:38
Message: AutoUpdate finished
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: ERROR: Could not find a source for updated package Sophos PureMessage
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: Installation of Sophos Network Threat Protection skipped
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: Installation of Sophos System Protection skipped
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: Installation of Sophos AutoUpdate skipped
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: Installation of Sophos Endpoint Defense skipped
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: Installation of SAVXP skipped
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: Installation of RMSNT skipped
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:37
Message: Downloading phase completed
Module: ALUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:36
Message: Product cache update from discovered server successfully finished
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:36
Message: Downloading product Sophos Network Threat Protection from server \\UTILITY\SophosUpdate\CIDs\S000\SAVSCFXP
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:35
Message: Product cache update from discovered server successfully finished
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:35
Message: Downloading product Sophos System Protection from server \\UTILITY\SophosUpdate\CIDs\S000\SAVSCFXP
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:34
Message: Product cache update from discovered server successfully finished
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:34
Message: Downloading product Sophos AutoUpdate from server \\UTILITY\SophosUpdate\CIDs\S000\SAVSCFXP
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:33
Message: Product cache update from discovered server successfully finished
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:33
Message: Downloading product Sophos Endpoint Defense from server \\UTILITY\SophosUpdate\CIDs\S000\SAVSCFXP
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:32
Message: Product cache update from discovered server successfully finished
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:32
Message: Downloading product SAVXP from server \\UTILITY\SophosUpdate\CIDs\S000\SAVSCFXP
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:31
Message: Product cache update from discovered server successfully finished
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:31
Message: Downloading product RMSNT from server \\UTILITY\SophosUpdate\CIDs\S000\SAVSCFXP
Module: CIDUpdate
Process ID: 17860
Thread ID: 9204

Time: 22/05/2017 15:31:31
Message: *************** Sophos AutoUpdate started ***************
Module: ALUpdate
Process ID: 17860
Thread ID: 9204