2440316 - Can't open a connection to site 'SYB_BACKUP' - SAP ASE

• A backup fails with with a message including "Can't open a connection to site 'SYB_BACKUP'"
• This error can be seen in different ways in log and returned to client
• And with additional accompanying messages in ASE and/or Backup Server log
  
  
• Typical examples include:
  
  
• Can't open a connection to site 'SYB_BACKUP'. See the error log file in the ASE boot directory.
  Could not establish communication with Backup Server 'SYB_BACKUP'. Please make sure that there is an entry in Sysservers for this server, and that the correct server is running.
  
  
• Msg 7210, Level 18, State 1:
  Server 'ASE', Line 1:
  Can't open a connection to site 'SYB_BACKUP' because 'set up channel' message could not be sent.
  
  
• Further ASE log messages can show
  
  
• nconnect: connect, Can't assign requested address
  
  
• Can't open a connection to site 'SYB_BACKUP' because 'set up channel' message could not be sent.
  
  
• Backup Server log message can show
  
  Open Server Error: 16219.10.0: A call to srv__waitfor_read() was interrupted by an attention
  Open Server Session Fatal Error: 16310.15.0: srv__read_tokenparams: Fatal error while Reading PARAMS TDS for spid: 26

SAP Adaptive Server Enterprise (ASE) All Versions

set up chanel, connection, sybmultbuf , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , Problem