Site files moved to new (identical) server; now iWeb gives "Publish Error"

Our school district just replaced the web server where our teachers publish iWeb sites. All user accounts, passwords, IP addresses, and content moved over just fine, but now when teachers try to publish updates to their existing sites on the new server, iWeb throws a "Publish Error: Unable to communicate with FTP server..." error. Test Connection in the publishing settings works fine, as does logging in to the server using an FTP application, so we know the user accounts are okay.
An interesting twist: I published my existing site (that was experiencing this issue) to a local folder on my desktop, and used a standalone FTP application to upload and replace my iWeb site files manually; when I went in and set the iWeb publishing settings back to FTP server, it was again able to publish updates to the site without issue.
We're looking into a permissions problem on the files that were moved from the old server but so far have not been able to find any differences.
Does anyone have any ideas what may be going on? We have a couple hundred people this is affecting and if it's something we can fix on the back-end instead of having to manually replace all of those site files, that would be a great thing!

The only time that I had to move a bunch of sites to a new server I was instructed by tech support to download all the sites/files and upload them to the new location.
I would assume that, if you don't do this, the permissions could get messed up.
My hosting service uses Webshell4 to manage files on the server. To change permissions you need to select the site folder in Webshell4 and click the "CHMOD" button to get a window that allows you to do this.
Read permissions should be checked for User, Group and Other.
Write permissions would normally be set for User only.
You could try this with one site to see if this is what's required but your hosting service tech support should really help you with this. That's what they are there for.

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    Literally these little unreliable and fragile cards are the power conduits and the nervous system for all external HD data transfer.
    SATA card as found inside a typical USB external hard drive
    The assumption that the hard drive is bad when its not!
    Countless 1000s of good external hard drives are thrown away each year because the owner thought the HD was bad when it fact it was the SATA bridge card which had failed. This card is removed in a matter of mere second once an external USB HD is cracked open from its plastic casing to reveal the bare HD and the attached SATA card which attaches between the HD and the USB cable.
    To complicate this problem, even many computer professionals do not know that there is a very easy solution to the “failing or dead HD” issue since the hard drive itself is very likely just fine.  Its astonishing that so many highly educated computer repair persons are unaware of this high-failure part, but this is mostly due to the fact that they do not juggle 100s of hard drives and know that of the iceberg that is a “external hard drive failure”, the mostly unseen majority are not a HD failure at all, but a bridge card failure.
    To add to this great misunderstanding is the fact that people assume that "likewise symptoms seen on an external HD are the same as seen on an internal HD, therefore also the external HD must be bad". This is a compositional fallacy of logic. Since internal HD do not have a SATA bridge interface, to conclude similar symptoms "indicate the same failure" is misplaced and incorrect.
    This is all not to say that HD do not fail, they do indeed, and I have seen many 100s of dead and failing hard drives.  Hard drives even under ideal conditions have a life expectancy of around 4-8 years due to ferromagnetic depolarization from entropy.  But of the mountain of symptoms that are seen as “hard drive failures” in comments, posts, and hearsay, half or more of these are not a HD failure at all.
    Once your rescued hard drive is removed from the bad SATA card
    You have several options, but the purchase of a $20 HD enclosure is one option, another is having a HD dock, however this eliminates the former portability in a 2.5" small HD.
    Remember that 3.5” HD require power, which means you need either a HD dock, or a powered SATA card kit as seen at top left in the picture below. 2.5” HD get power from the USB port itself.
    Just remember that the serious downside to the low cost external HD enclosures is THEY TOO contain these SATA cards, and what is worse the cheap ones will fail, often, much quicker than the original factory one did! In which case it is recommended you buy a quality HD USB enclosure
    Rescue tools to use with your extracted HD for data recovery

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