Since I upgraded from 16.4 to 17.1 (all Mac), users have been complaining about 
4D Client disconnects. Messages like:

"The current connection to the database has been disrupted. Connection error 
with the server. Please restart the application."

"Unknown Error. Connection error with the server. Please restart the 
application."

It is an all local single switch network with default timeouts. I experimented 
with changing timeouts, but it did not help.

The server hardware also changed (new 2018 Mac Mini), so I'm looking into that. 
One curious thing I noticed is the "Application Server" tab shows it to be 
listening on two IP addresses: 192.168.X.X and 169.254.X.X. The 192 address is 
expected and the only active network connection on the computer. Why would the 
server be listening on a 169 link-local address and where did that come from? I 
don't see that when I run the server on my laptop under the same operating 
system (10.14 Mojave).

Digging into it with Wireshark is next, but hoping someone might suggest an 
easier path.

John DeSoi, Ph.D.


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