MikroTik

Changed Internet service provider and now we have strange problem. RDP, SNMP, POP3 protocols working fine, but HTTP and HTTPS have strange behavior. google-sites working exelent. Other sites - waiting for connections.
Please help. Can't working now.

Temprary: I made old ISP as http, https forwarder. Now http, https working without any issues.
How to investigate this problem?