Можно ли сделать подключение через OpenVPN без сертификатов?

[Gamerman]

... но через пароль?

[Хостинг HostFood.ru]

Тарифы на хостинг в России, от 12 рублей: https://www.host-food.ru/tariffs/hosting/
Тарифы на виртуальные сервера (VPS/VDS/KVM) в РФ, от 189 руб.: https://www.host-food.ru/tariffs/virtualny-server-vps/
Выделенные сервера, Россия, Москва, от 2000 рублей (HP Proliant G5, Intel Xeon E5430 (2.66GHz, Quad-Core, 12Mb), 8Gb RAM, 2x300Gb SAS HDD, P400i, 512Mb, BBU):
https://www.host-food.ru/tariffs/vydelennyi-server-ds/
Недорогие домены в популярных зонах: https://www.host-food.ru/domains/

[vadim64]

wikipedia.org

bla-bla-bla
Authentication

OpenVPN has several ways to authenticate peers to one another. OpenVPN offers pre-shared secret key, certificate-based, and username/password-based authentication. Preshared secret key is the easiest, with certificate based being the most robust and feature-rich. The username/password is a new feature (version 2.0) that can be used with or without a client certificate (the server still needs a certificate). The source tarball includes a sample Perl script to verify the username/password with PAM and a C auth-pam plugin.
bla-bla-bla