Comptroller of Maryland Logo

Annapolis Data Center

Service Desk: (410) 260-7400
servicedesk@marylandtaxes.gov

Host Access in the Cloud (HAC)

HAC provides secure web access to the Annapolis Data Center (ADC) mainframe environment. To protect State systems and data, all users must complete registration before first use. After registration, use the HAC link to sign in with your organization’s credentials and multi‑factor authentication (MFA).

Registration Steps

Important: The registration links below are different for State Employees and State Contractors. Be sure to select the correct registration button for your role.

State Employees

  1. Click Register as State Employee below.
  2. Enter your Maryland.gov or applicable state agency email address.
  3. Complete your organization’s MFA and sign in.
  4. Click Continue in the "ADC Mainframe Web Session Access Request" window.
  5. Answer the required questions and click Continue.
  6. Review the consent form and select Submit Request.
  7. Allow up to one minute for processing before continuing.
  8. Bookmark the HAC sign‑in page: https://adc-hac.marylandcomptroller.gov.
  9. Navigate to the page and click Accept after reviewing permissions.

Register as State Employee

State employees only register once using Maryland.gov or applicable state agency email domain.

State Contractors

  1. Click Register as Contractor below.
  2. Enter your organization email address.
  3. Complete MFA and your organization’s SSO login.
  4. Click Continue in the “ADC Mainframe Web Session Access Request” window.
  5. Answer the required questions and click Continue.
  6. Review the consent form and select Submit Request.
  7. Allow up to one minute for processing before continuing.
  8. Bookmark the HAC sign‑in page: https://adc-hac.marylandcomptroller.gov.
  9. Navigate to the page and click Accept after reviewing permissions.

Register as Contractor

State contractors must re-register every 90 days using their organization email and MFA.

Need Help?

If you experience issues, contact the ADC Service Desk: