Proxy of A record does not work

We have domain and had always proxy enabled on our one of A records (dvs). This A record points to our Firewall, from were NAT goes to our internal IIS enabled server. It worked fine, until i moved our website to another hosting provider. I changed IP address on A and CNAME for that site, enabled proxy, purged cache and it started working. But then - i realized that dvs record does not work anymore, i receive 522 error if i enable proxy. Firewall does not block anything, at least from what i saw and we did not changed there any rules.
Can someone help in solving this, because i already lost my head in figuring were something went wrong. Is it from DNS side, or from our FW side.

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