I'm pulling my hair out figuring this out. My startup-config is good, I can view it with a show command. I'm trying to copy it to a tftp server:

asa5505# copy startup-config tftp

Address or name of remote host []? ipaddress

Destination filename [startup-config]? t
!!
%Error writing tftp://ipaddress/t (Timed out attempting to connect)

On my TFTP server (SolarWinds), I get the following:

binary, PUT. Started file name: C:\TFTP-Root\t
binary, PUT. File Exists, C:\TFTP-Root\t
binary, PUT. Deleting Existing File.
binary, PUT. Interrupted by client, cause: The process cannot access the file 'C:\TFTP-Root\t' because it is being used by another process

I've used tftpd32 with same results. I've tried different servers, even one on the same network as the asa ... same results. It'll create a 0 byte file and never do the dump. What's going on? Everything is working normally except for this.