Error Code 150 Outlook

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Original KB number: 923575

Symptoms

When Microsoft Outlook tries to connect to a server by using a remote procedure call (RPC) connection or a secure HTTP (HTTPS) connection, you receive one of the following error messages:

  • Error message 1

    There is a problem with the proxy server's security certificate, %s. Outlook is unable to connect to this server. (%s)

  • Error message 2

    There is a problem with the proxy server's security certificate, %s. The name on the security certificate is invalid or does not match the name of the site. Outlook is unable to connect to this server. (%s)

  • Error message 3

    There is a problem with the proxy server's security certificate, %s. The security certificate is not from a trusted certifying authority. Outlook is unable to connect to this server.(%s)'

  • Error message 4

    There is a problem with the proxy server's security certificate. The name on the security certificate is invalid or does not match the name of the target site outlook.office365.com. Outlook is unable to connect to the proxy server (Error Code 0)

Notes about the error messages

  • The %s placeholder is the Outlook profile property 001f6622. This is the Microsoft Exchange Server RPC proxy server name.

  • The (%s) placeholder is the error code.

    For error message 1 and error message 2, the error code that's returned is the sum of all the bitmask certificate problem codes. See the 'More information' section for information about the bitmask certificate problem codes.

    For error message 3, the error code is expected to always be 0x00000008.

Cause

This issue may occur if one or more of the following conditions are true:

  • The connection to the server requires a certification authority (CA).
  • You haven't trusted the certification authority at the root.
  • The certificate may be invalid or revoked.
  • The certificate doesn't match the name of the site.
  • A third-party add-in or a third-party browser add-in is preventing access.

Resolution 1: Examine the certificate for error message 1 or 2

Examine the certificate. Then, contact your system administrator to resolve this issue.

To examine the certificate, follow these steps:

  1. In Microsoft Internet Explorer, connect to the RPC server or to the secure server. For example, type https://www. server_name.com/rpc in the Address bar of the Web browser, and then press Enter.

    Note

    The server_name placeholder references the RPC server name or the secure server name.

  2. Double-click the padlock icon that's located in the lower-right corner of the Web browser.

  3. Click the Details tab.

  4. Note the information in the following fields:

    • Valid to
      The Valid to field indicates the date until which the certificate is valid.
    • Subject
      The data in the Subject field should match the site name.

Resolution 2: Install the trusted root certificate for error message 3

To install the trusted root certificate on the client, follow these steps:

  1. Click Install Certificate when you're prompted with the Certificate dialog box.
  2. Click Next.
  3. Click to select the Place all certificate in the following store check box.
  4. Click Browse.
  5. Click Trusted Root Certification Authorities > OK.
  6. Click Next.
  7. Click Finish.
  8. Click OK.

For references, see Installing a trusted root certificate.

Resolution 3: Disable the third-party add-in or the third-party browser add-in for error message 4

Error Code 150 Outlook

Disable third-party add-ins

  1. Start Outlook in safe mode to help isolate the issue. To do this, click Start > Run, type outlook.exe /safe, and then click OK.

    If Outlook successfully starts in safe mode, the issue that you're experiencing may be caused by a third-party add-in.

  2. Check for third-party COM add-ins and disable them. To do this, follow these steps:

    1. On the File menu, click Options > Add-Ins.
    2. In the Manage box, click COM Add-ins > Go.
    3. Click to clear the check box next to the third-party add-ins that you want to disable.
    4. Restart Outlook.

For more information, see the 'Step 6: Start Outlook in safe mode' section of the following Microsoft Knowledge Base article:

2632425 How to troubleshoot crashes in Outlook 2010 and Outlook 2013

Disable third-party browser add-ins

Outlook uses Internet Explorer settings for HTTP requests. If a third-party browser add-in is causing this issue, disable it in Internet Explorer. For steps on how to do this, see the 'Disable add-ons in Internet Explorer' section of the following Microsoft Knowledge Base article:

956196 'Internet Explorer cannot display the webpage' error

More information

The bitmask certificate problem codes are listed in the following table.

DescriptionError code
FLAG_CERT_REV_FAILED0x00000001
FLAG_INVALID_CERT0x00000002
FLAG_CERT_REVOKED0x00000004
FLAG_INVALID_CA0x00000008
FLAG_CERT_CN_INVALID0x00000010
FLAG_CERT_DATE_INVALID0x00000020
FLAG_CERT_WRONG_USAGE0x00000040
FLAG_SECURITY_CHANNEL_ERROR0x80000000
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It's frustrating when you get an error after sending an email message. This topic describes what you can do if you see error code 550 5.1.0 or 5.1.0 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN).

Use the information in the NDR to help you decide how to fix the problem.

Why did I get this bounce message?

The destination email server that generated the 5.1.0 error won't accept messages from you (the sender) or messages for the recipient. This can happen if messages from you (your email address, your Exchange Online organization, or even all of Exchange Online) are being blocked by the recipient.

I got this bounce message. How do I fix it?I'm an email admin. How do I fix this?Details for error code 5.1.0

I got this bounce message. How do I fix it?

This section contains steps that you can try to fix the problem yourself.

Outlook

If these steps don't fix the problem for you, contact your email admin and refer them to this topic so they can try to resolve the issue for you.

You're in the recipient's block list

Your email address could be in the recipient's personally-maintained block list. This is the likely cause if you can successfully send messages to other recipients in the same domain (for example, @fabrikam.com).

Contact the recipient (by phone, in person, etc.) to verify that your email address isn't in their block list.

Remove bad entries from your Auto-Complete List

You might have an invalid entry in your Auto-Complete list (also known as the nickname cache) for the recipient. For example, the recipient might have been moved from an on-premises Exchange organization to Exchange Online, or vice-versa. Although the recipient's email address is the same, other internal identifiers for the recipient might have changed, thus breaking your cached entry for the recipient.

Fix your Auto-Complete list entries in Outlook

To remove invalid recipients or all recipients from your Auto-Complete list in Outlook 2010 later, see Manage suggested recipients in the To, Cc, and Bcc boxes with Auto-Complete.

To resend the message in Outlook, see Resend an email message.

Fix your Auto-Complete list entries in Outlook on the web

To remove recipients from your Auto-Complete list in Outlook on the web (formerly known as Outlook Web App), do one of the following procedures:

Remove a single recipient from your Outlook on the web Auto-Complete list
  1. In Outlook on the web, click New mail.

  2. Start typing the recipient's name or email address in the To field until the recipient appears in the drop-down list.

  3. Use the Down Arrow and Up Arrow keys to select the recipient, and then press the Delete key.

Remove all recipients from your Outlook on the web Auto-Complete list

You can only clear your Auto-Complete list in the light version of Outlook on the web. To open your mailbox in the light version of Outlook on the web, do either of the following steps:

  • Open the mailbox in an older web browser that only supports the light version of Outlook on the web (for example, Internet Explorer 9).

  • Configure your Outlook on the web settings to only use the light version of Outlook on the web (the change takes effect the next time you open the mailbox):

    1. In Outlook on the web, click Settings .

    2. In the Search all settings box, type light and select Outlook on the web version in the results.

    3. In the page that opens, select Use the light version of Outlook on the web, and then click Save.

    4. Log off, close your web browser, and open the mailbox again in Outlook on the web.

After you open your mailbox in the light version of Outlook on the web, do the following steps to clear all entries from your Auto-Complete list:

Error Code 150 Outlook Mail

  1. Choose Options and verify that Messaging is selected.

  2. In the E-Mail Name Resolution section, click Clear Most Recent Recipients list, and then click OK in the confirmation dialog box.

  3. While you're still in Options, to return your mailbox to the full version of Outlook on the web, go to Outlook version, clear the check box for Use the light version, and then click Save.

  4. Log off and close your web browser. The next time you open your mailbox in a supported web browser, you'll use the full version of Outlook on the web.

I'm an email admin. How do I fix this?

The Sender Policy Framework (SPF) record for your Exchange Online domain might be incomplete, and might not include all sources of mail for your domain. For more information, see Set up SPF to help prevent spoofing.

Error

Details for error code 5.1.0

Error Code 150 Outlook Mac

The NDR from Exchange Online for this specific error might contain some or all of the following information:

  • User information section: Address Rejected. A problem occurred during the delivery of this message to this email address.

  • Diagnostic information for administrators section: Recipient address rejected: SPF Permanent Error.

Still need help?

Error Code 150 Outlook 2011 Mac

Error

See also