2809481 - Error 7235: No other query entry found for the remote server - SAP ASE

The following error is reported in the ASE errorlog:

<Windows>
kernel  nl__connect: Could not connect to site '<BackupServer_Name>', socket 103.
kernel  nl__connect: net_connect failed to connect to site '<BackupServer_Name>'.
: No connection could be made because the target machine actively refused it.

server  Failed to connect to remote server <BackupServer_Name> nlwnsck ether <Server> <Port> for site SYB_BACKUP. Trying the next query entry of this server, if any.
server  Error: 7235, Severity: 17, State: 0
server  No other query entry found for the remote server <BackupServer_Name> - site SYB_BACKUP. Aborting this site handler, as no remote server responded. Please make sure the remote server is accepting connections.

<Linux>
kernel  nspacket: send, Connection refused
server  Error: 7215, Severity: 18, State: 1
server  Can't send to site 'SYB_BACKUP'.
server  Failed to connect to remote server <BackupServer_Name> tcp ether <Server> <Port> for site SYB_BACKUP. Trying the next query entry of this server, if any.
server  Error: 7235, Severity: 17, State: 0
server  No other query entry found for the remote server <BackupServer_Name> - site SYB_BACKUP. Aborting this site handler, as no remote server responded. Please make sure the remote server is accepting connections.

SAP Adaptive Server Enterprise (ASE)

7205, 10061 , KBA , BC-SYB-ASE , Sybase ASE Database Platform (non Business Suite) , BC-DB-SYB , Business Suite on Adaptive Server Enterprise , Problem