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Unable to send pictures

When a user tries to send an image to another user in Spark 2.8.3 Build 960, the other user accepts the image and the download bar stays at 0% and never downloads.
Says that the File Transfer Request:
“Negotiating connection stream, please wait…” and just sits there. This was working fine since forever and this issue JUST started today.
Any thoughts?

Are you sure it was working before? Maybe you just updated to 2.8.3? File transfer is degraded in 2.8 and works better with 2.7 versions. If it was working with 2.8.3, then maybe some change happened in the network. 2.8 usually works fine with transfers in the same subnet, but struggles to negotiate stream between different subnets and of course when internet is involved.

The users say it has been working fine until today, at about 9:30 am.
Our server is running Openfire 4.3.2. Is there a way to downgrade everyone?

id check the normal stuff if this is a new behavior…firewall, antivirus, etc.

This does seem like some network change/failure. Before downgrading everyone try a few users and see if it helps. There is no built-in mechanism to downgrade Spark. You will have to do this manually or come up with some script. 2.7.7 https://github.com/igniterealtime/Spark/releases/tag/v2.7.7

Downgrading to 2.7 worked. Thank you. I will see if I can look into the 2.8 on our side (firewall etc) but at least I have a way to fix it. Thank you all.