When logging in to Sage 200 the following error will occur due to certain Authentication settings being configured incorrectly. The error will only be on the clients machines. Logging in to Sage 200 on the server will not cause this error.

Communication Error

IIS Windows authentication settings

  1. Within IIS, expand Sites > select Sage 200 App Services > double-click the Authentication icon in the Features area.
  2. Select Windows Authentication. Ensure this is set to Enabled. If not, select Enable in the Actions panel on the right.
  3. Also in the Actions panel, select Advanced Settings…
  4. Ensure the checkbox for ‘Enable Kernel-mode authentication’ is ticked > OK.
  5. Reset IIS

IIS Anonymous Authentication settings

  1. Within IIS, expand Sites > select Sage 200 App Services > double-click the Authentication icon in the Features area.
  2. Select Anonymous Authentication.. Ensure this is set to Enabled. If not, select Enable in the Actions panel on the right.
  3. Also in the Actions panel, select Edit…
  4. Ensure ‘Specific user’ is selected > Set…
  5. Enter the fully qualified Sage 200 Services username and password. This is the username and password you specified during the installation of Sage 200. For example, <domain>\Sage200Services.
  6. Press OK and reset IIS.

LAN Manager Authentication level

  1. Select Start > Control Panel > Administrative Tools > Local Security Policy.
  2. Double-click the Local Policies folder and select Security Options.
  3. From the list of policies, double-click ‘Network security: LAN Manager authentication level’.
  4. From the drop-down list, select ‘Send LM & NTLM – use NTLMv2 session security if negotiated’ and select OK.

If the error persists…

  • If you are using a Workgroup, password protected sharing will cause the above message to appear. This should be turned off within the Control Panel > Network and Sharing Centre > Change Advanced Sharing Settings.
  • Ensure the server that hosts the Sage 200 Web Services has been added as trusted site within Internet Explorer Options. You can access this within Internet Explorer > Tools > Internet Options > Security tab > Trusted Sites > Sites.

Where an IIS reset is required above, all users must be logged out of Sage 200 and indeed any other system which use’s IIS.

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