Has your problem been resolved?
I encountered the same issue recently. This is how i was able to resolve it:
1. Set the JAVA Env Variables
JAVA_HOME : C:\Program Files\Java\jdk1.8.0_05
PATH: C:\Program Files\Java\jdk1.8.0_05\bin
2. Since it is HTTPS based backend destination, import its certificate to SMP keystore file
Run this below under C:\SAP\MobilePlatform3\Server\configuration
keytool -import -v -alias sapgatewaycert -keystore smp_keystore.jks -storepass changeit -file c:\certificatelocation.cer
where changeit: smp keystore password (you must have set it during SMP server installation)
3. Press 'Y' for confirmation
4. Restart SMP server machine.
Rgrds,
JK