Error -3259 Lost communication with host

[lesterd]

I have a problem that has popped up recently.

We had to reinstall a server.

Everything works fine with all the files with client on the local network, but some files, when accessed remotely, open OK but then crash when scripts are executed.

I get the message "Communication with host was interrupted and could not be reestablished (-3259)

What do I have to do with the crashing files to solve the problem?

Lester