Dear Clients,
In the future we will accept only TLS 1.2 as the cryptographic protocol of the web services offered by KELER Zrt.
Therefore, in line with international practice, in order to ensure the security of our service, we are moving all of our online services to Transport Layer Security (TLS) 1.2+. Consequently, as of 1 February 2018, our online services will not accept TLS versions lower than TLS 1.2.
As of 1 February 2018, all client-server and browser-server combinations must use TLS 1.2. or newer protocol versions to enable problem-free connection to our services.
Although the current analysis of service connections shows that only very few of our clients use TLS 1.0. and 1.1. protocols, some clients and browsers may have to be upgraded. For this reason, our clients are kindly requested to upgrade the clients and servers concerned before TLS 1.0. and 1.1. support is discontinued.
If you require any further information, please feel free to call us on +36 1 483 6120 or contact us on the following email address: 
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Sincerely,
KELER Ltd.