Test mail failure: cURL error 35: TCP connection reset by peer

Replies: 0

Everything was good until I tired to send a test email. I was using Gmail, and this is the error log.

Thank you!

Versions:
WordPress: 4.9.8
WordPress MS: No
PHP: 7.0.31
WP Mail SMTP: 1.3.3

Params:
Mailer: gmail
Constants: No
Client ID/Secret: Yes
Auth Code: Yes
Access Token: No

Server:
OpenSSL: Yes
PHP.allow_url_fopen: Yes
PHP.stream_socket_client(): Yes
PHP.fsockopen(): Yes
PHP.curl_version(): Yes
Apache.mod_security: No

Debug:
Mailer: Gmail
cURL error 35: TCP connection reset by peer (see http://curl.haxx.se/libcurl/c/libcurl-errors.html)