Connection through proxy?

I am seeing the following on the first run, probably in trying to download the mode files:

**12:32:21.231 [main] WARN org.allenai.datastore.Datastore - com.amazonaws.SdkClientException: Unable to execute HTTP request: Connect to public.store.dev.allenai.org.s3.amazonaws.com:443 [public.store.dev.allenai.org.s3.amazonaws.com/52.218.192.226] failed: connect timed out while downloading org.allenai.scienceparse/productionModel-v9.dat. 10 retries left.**
-- snip --

Are there additional setting required to make the work through proxy? Or, is it a certificate issue?

I have https_proxy set and able to wget URLs, but have to work around certificate issue:

**WARNING: cannot verify public.store.dev.allenai.org.s3.amazonaws.com's certificate, issued by ‘/C=US/O=DigiCert Inc/OU=www.digicert.com/CN=DigiCert Baltimore CA-2 G2’:
Unable to locally verify the issuer's authority.**

Thanks.