3298283 - When upgrading HANA DB, "Connect failed (code = -10709): Connect failed (connect timeout expired)" occurred.

When upgrading HANA DB, "Connect failed (code = -10709): Connect failed (connect timeout expired)" occurred and no specific port being pointed.

From hdblcm.log:
xx:xx:xx.xxx - INFO:     Output line 9: Upgrade failed
xx:xx:xx.xxx - INFO:     Output line 10:   running in batch mode
xx:xx:xx.xxx - INFO:     Output line 11:     Cannot establish database connection
xx:xx:xx.xxx - INFO:     Output line 12:       Connect failed (code = -10709): Connect failed (connect timeout expired)

From nameserver trace:
[xxxx]{-x}[-x/-x] xxxx-xx-xx xx:xx:xx.xxxxxx i net_publicname   Utils.cpp(xxxx) : public hostname resolution: use default route as ip -> abc.xxx.xxx.xxx

From /etc/hosts(maintain one host with different IPs):
abc.xxx.xxx.xxx  Saphana
def.xxx.xxx.xxx   Saphana  

SAP HANA Platform Edition 1.0 or higher

Connect failed (code = -10709), hostname, hdblcm, 10709 , KBA , HAN-LM-UPG-DB , Upgrade of HANA Database , Problem