Exchange Hybrid Wizard Returns an MRS Proxy Server Error

After installing Exchange 2016 and properly configured the URLs, I proceeded to run the Hybrid Configuration Wizard via Office365 portal to find an MRS Proxy error.

MRS Proxy Error

To solve this problem, I took the following steps:

  1. Open the Exchange Management Shell.
  2. Run the following command
Get-WebServicesVirtualDirectory "ServerName\EWS (Default Web Site)" |FL Server,MRSProxyEnabled

If “MRSProxyEnabled :False” is returned in the output, this is the cause of the issue.

However, in my case the results where different. The command returned“MRSProxyEnabled :Enabled”. There is an issue on the hybrid server in which MRSProxy shows as Enabled when you run the Get-WebServicesVirtualDirectory cmdlet, but MRSProxy is actually disabled.

SOLUTION: To solve this issue, users will have to Disable the MRSProxy, restart the IIS services, and Re-Enable the MRSProxy

Set-WebServicesVirtualDirectory "<ServerName>\EWS (Default Web Site)" -MRSProxyEnabled $false
Set-WebServicesVirtualDirectory "<ServerName>\EWS (Default Web Site)" -MRSProxyEnabled $true

Interested in deploying multi-factor authentication for your business? It is now part of Office 365

Multi-factor authentication is now part of Office 365 and available for all users. Any of the following may be used for the second factor of authentication.

  1. Call my mobile phone. The user receives a phone call that asks them to press the pound key. Once the pound key is pressed, the user is logged in.
  2. Text code to my mobile phone. The user receives a text message containing a six-digit code that they must enter into the portal.
  3. Call my office phone. This is the same as Call my mobile phone, but it enables the user to select a different phone if they do not have their mobile phone with them.
  4. Notify me through app. The user configured a smartphone app and they receive a notification in the app that they must confirm the login. Smartphone apps are available for Windows Phone, iPhone, and Android devices.
  5. Show one-time code in app. The same smartphone app is used. Instead of receiving a notification, the user starts the app and enters the six-digit code from the app into the portal.

For more information about Multi-Factor Authentication for Office 365 please read the TechNet article Multi-Factor Authentication for Office 365

Is your on-premise exchange availability higher than Office 365?

during my past positions and while I was supporting and maintaining infrastructures, I was always concerned about meeting the internal SLA and keeping track of the uptime and availability of the services.

Office 365 is just making our roles in the IT shop a lot easier. It is well-know that Microsoft is investing heavily in its SaaS offering, and they invest deeply in infrastructure upgrades to ensure a highly available service to Office 365 tenants.

Microsoft had released information that measure availability as the number of minutes that the Office 365 service is available in a calendar month as a percentage of the total number of minutes in that month. Microsoft called this measure of availability “the uptime number”. Within this calculation Microsoft included their business, government and education services finding the subsequent worldwide uptime number for Office 365 for following quarters:

  • Q3 – 2012: 99.98
  • Q4 – 2012: 99.97%,
  • Q1 – 2013: 99.94%
  • Q2 – 2013: 99.97%

I need to clarify that based on Microsoft documentation it is possible that individual customers may experience higher or lower uptime percentages compared to the global uptime numbers depending on location and usage patterns.

Just take a look on what ITIL Availability percentages really means for a 24/7 services.

Availability %

Downtime per year

Downtime per month*

Downtime per week


3.65 days

7.20 hours

1.68 hours


1.83 days

3.60 hours

50.4 minutes


17.52 hours /

1051.2 minutes

86.23 minutes

20.16 minutes


(“three nines”)

8.76 hours /

525.6 minutes

43.2 minutes

10.1 minutes


4.38 hours /

262.8 minutes

21.56 minutes

5.04 minutes


(“four nines”)

52.6 minutes

4.32 minutes

1.01 minutes


(“five nines”)

5.26 minutes

25.9 seconds

6.05 seconds


(“six nines”)

31.5 seconds

2.59 seconds

0.605 seconds

99.99999% (“seven nines”)

3.15 seconds

0.259 seconds

0.0605 seconds

After seeing this data, let’s think for a minute which processes do we have in place to guarantee the SLAs of our service delivery and answer the question, is your on-premise exchange availability higher than Office 365?