curl: Socket not ready for send

Solution Verified - Updated -

Issue

Curl doesn't work properly through the proxy (with --proxytunnel) while connecting to a remote FTPS server.

In place of successful negotiation the following messages are received:

... output omitted...
* Proxy replied OK to CONNECT request
* Initializing NSS with certpath: sql:/etc/pki/nssdb
* Closing connection 0
curl: (81) Socket not ready for send/recv

Environment

Red Hat Enterprise Linux 7
package: curl-7.29.0-25.el7.x86_64 - curl-7.29.0-35.el7.x86_64

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