btcbx wrote: ↑
Mon Dec 02, 2019 8:46 am
Once the post is submitted they are asked to log in again. Once they log in, the post is submitted without the attachment. Occasionally their attachment will work.
The "asked to login again" might be a key observation there. Possibly not actually an issue with "slow upload of the attachment", but maybe something less direct such as "these satellite-based ISPs are sometimes changing the user's IP address by the time they try and post." Possibly leading to a "you're not the right owner of this session" conclusion.
In ACP General, Server Configuration, Security Settings
, what is the "Session IP validation:"
currently set to? If it's currently "All" or "A.B.C", maybe run with it set to "A.B" or "None" for a while, to see if they continue reporting the symptom.
Another aspect of that: If they're being asked to login again, confirm whether they are using the "Remember me" option during their logins. Meaning even if they were given a new session, should they have been automatically logged in without notice? Or is that behavior failing too, as though existing saved cookies simply were not transmitted?