If necessary you may limit access to web-interface of the "Manage your account" section under your contract, allowing thereby authorization only from specific IP-addresses.
To restrict access to the "Manage your account" section for all IP-addresses, except for the trusted ones, you will need to:
Issue an official letter
General rules of letter issuance
Submit original documents to RU-CENTER
The documents may be delivered to RU-CENTER Administrative and Technical Center or Office, or posted to:
Regional Network Information Center (RU-CENTER), 2/1, 3d Khoroshevskaya str., Moscow, 123308, Russian Federation
Await confirmation about the set filter
When IP-address access restriction comes into force, RU-CENTER support service will send you a letter to the e-mail specified in the contract.
The information in letter and in RU-CENTER data base shall be identical. A copy of passport should be attached to the letter from an individual.
Please pay attention to general rules of letter issuance.