Symptoms
When trying to rsync data between two cPanel servers, you may experience a timeout or connection failure similar to the following:
packet_write_wait: Connection to 203.0.113.2 port 22: Broken pipe
rsync: connection unexpectedly closed (104508573 bytes received so far) [receiver]
rsync error: error in rsync protocol data stream (code 12) at io.c(226) [receiver=3.1.2]
rsync: connection unexpectedly closed (104542504 bytes received so far) [generator]
rsync error: unexplained error (code 255) at io.c(226) [generator=3.1.2]
Description
While these issues aren't related to the cPanel software on the machine, the error message can help diagnose the problem. The rsync man page includes the following list of exit codes:
0 Success
1 Syntax or usage error
2 Protocol incompatibility
3 Errors selecting input/output files, dirs
4 Requested action not supported: an attempt was made to manipulate 64-bit files on a platform that cannot support them; or an option was specified that is supported by the
client and not by the server.
5 Error starting client-server protocol
6 Daemon unable to append to log-file
10 Error in socket I/O
11 Error in file I/O
12 Error in rsync protocol data stream
13 Errors with program diagnostics
14 Error in IPC code
20 Received SIGUSR1 or SIGINT
21 Some error returned by waitpid()
22 Error allocating core memory buffers
23 Partial transfer due to error
24 Partial transfer due to vanished source files
25 The --max-delete limit stopped deletions
30 Timeout in data send/receive
35 Timeout waiting for daemon connection
Workaround
The above example shows error code 12, which indicates an issue with the data stream. Error code 12 can occur due to network issues, disk space problems on the source or destination server, or data missing from the source machine on which the rsync file list was generated.
Please note that if you require further guidance with rsync, we advise contacting a qualified system administrator for further support.
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