Failed to replicate from all update sources

Question

Recently deployed Sophos AV for Linux on a few servers. 
 Installation goes well following the documentation. 
 I have created the update sources on our Enterprise Console and downloaded the appropriate installation subscriptions. 
 When it come to updating from the client it fails with the following: 
 Downloading sophos.domain.com/.../cidsync.upd 155 bytes downloaded in 0.002091 secs (72.392246 KiB/s) Failed to replicate from sophos.domain.com/.../savlinux Failed to replicate from all update sources 
 Primary update source is sophos.domain.com/.../savlinux and is where it was initially installed from. 
 Any ideas?

QC · Accepted Answer

Hello Kyle, 
 Says "200" yes, that's the problem. IIS should return a 404 status code, instead it returns success. The updater checks the file, determines that its contents are not what it expected and subsequently fails. It's related to the Custom Error Pages, can't say what could be mis-configured though. 
 Christian