Comment by throw0101c

> The underlying TDS communications protocol (https://www.freetds.org/tds.html) had a fixed 30 byte field for the hostname and the customer had a particularly long FQDN that was being copied in without any checks on its length. An easy fix once identified.

I had to file a bug with a vendor because their hostname handling had a similar issue: I think it was 64 max.

There was some pushback about if it was "really" a problem, so I ended up quoting the relevant RFCs to argue that they were not compliant with Internet standards, and eventually they fixed the issue.