Replication Problem

We have been having a scheduled replication, For some reason i do not understand what's causing this problem.

But On-Demand replication works absolutely fine...

I have had performed all the troubleshooting techniques which are provided in the replication guide.

When i look at archive server log..

8/18/2008 6:21:13 PM ArchiveServerService Error Replication 0 N/A PDMSERVER Failed to replicate file from server!
Source server: 10.6.1.19:3030
Vault: MILWAUKEE
File ID: 0x00002591
Version: 1
Unique version: 0x00003A18
Error: (null)
Description: The latest version of the file is not available on your local archive server. All attempts to download the file from remote servers failed.


8/18/2008 6:21:13 PM ArchiveServerService Error Replication 0 N/A PDMSERVER "An error occurred when trying to replicate a file.
File ID 0x2591 (type 0)
Priority Low
State 1
Requested ver 1

"
Response on this is highly appreciated SolidworksSolidworks Pdm enterprise Pdm