Cannot update Linux antivirus using /opt/sophos-av/bin/savupdate

Question

Why I cannot update Sophos Antivirus for Linux (v 9.2.3) from corporate server using Primary server http://[server_ip]:8888 and Secondary server http://[server_fqdn]:8888?

I see the following error:

[root@RedHat-Sophos-test ~]# /opt/sophos-av/bin/savupdate
Downloading http://[server_ip]:8888/CIDs/S000/savlinux/server.inf
Downloading http://[server_ip]:8888/CIDs/S000/savlinux/savlinux/server.inf
Downloading http://[server_ip]:8888/CIDs/S000/savlinux/sdds:SOPHOS/server.inf
Failed to replicate from http://[server_ip]:8888/CIDs/S000/savlinux
Downloading http://[server_fqdn]:8888/CIDs/S000/savlinux/server.inf
Downloading http://[server_fqdn]:8888/CIDs/S000/savlinux/savlinux/server.inf
Downloading http://[server_fqdn]:8888/CIDs/S000/savlinux/sdds:SOPHOS/server.inf
Failed to replicate from http://[server_fqdn]:8888/CIDs/S000/savlinux
Failed to replicate from all update sources

[root@RedHat-Sophos-test ~]#

And no one file with name "server.inf" in BootStrap directory \\SOPHOS\SophosUpdate\CIDs\S000\savlinux

Version of Sophos Enterprise Console = 5.1.0.1839.

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DouglasLeeder · Accepted Answer

The problem is not the 404 (file missing) - which are to be expected (server.inf is only for use by Sophos WebCIDs to allow DOS redirection).

The problem is the 403 (Forbidden) which the server returns for the last request, which aborts the update.

Stop the server from returning 403 for a valid (if absent) request, then the update should proceed to the cidsync.upd and update successfully.