Direct push stop working for many iphones but not for all. including Android.

Hi Guys,
We have 2 node DAG and devices are connecting to Kemp load balancer for HA. Last week,There were Cisco Network switch activity(network team had upgraded switch firmware) and since then few iphone' direct push is stop working however fetch
is working fine. There is no alert on LB/exchange .
Funny things is, my iphone is working fine .. i am getting email before it shows on outlook.
Additionally when i checked active sync for my account or others (having issue)https://testconnectivity.microsoft.com/ there are some error (attached).
Amit Rawat | MCITP - Exchange 2007/2010| CCNA |MCSE- 2003| Lync 2010|http://blog.amitrawat.net

Hi Amit,
According to your description, I understand that some mobile phone cannot get the push from Exchange server after add an Cisco Network switch in your environment, besides test ActiveSync failed with very long delay.
I want to double confirm some points, please help to collect the answer for following questions:
1. What’s the function for Kemp load balance, hardware or network traffic optimization?
2. Are you using Cisco network switch as network load balance functionality?
3. How about the Outlook sync from the external?
Depend on the error message and your test, it’s related to Network issue instead of  Exchange.
Please try to use Microsoft Network Monitor to get more detail progress of the connection of sync, for more resource: 
http://www.microsoft.com/en-in/download/details.aspx?id=4865
Additional, please contact Mobility and ActiveSync Team so that you can get more professional suggestions. For your convenience:
https://social.technet.microsoft.com/Forums/en-US/home?forum=exchangesvrmobilitylegacy
Best Regards,
Allen Wang

Similar Messages

  • Direct push stop working for many iphones but not all including Android.

    Hi Guys,
    We have 2 node DAG and devices are connecting to Kemp load balancer for HA. Last week,There were Cisco Network switch activity and since then few iphone' direct push is stop working however fetch is working fine. There is no alert on LB/exchange
    Funny things is, my iphone is working fine .. i am getting email before it shows on outlook.
    Additionally when i checked active sync for my account or others (having issue)https://testconnectivity.microsoft.com/ there are some error (attached).
    Amit Rawat | MCITP - Exchange 2007/2010| CCNA |MCSE- 2003| Lync 2010|http://blog.amitrawat.net

    Hi Amit,
    According to your description, I understand that some mobile phone cannot get the push from Exchange server after add an Cisco Network switch in your environment, besides test ActiveSync failed with very long delay.
    I want to double confirm some points, please help to collect the answer for following questions:
    1. What’s the function for Kemp load balance, hardware or network traffic optimization?
    2. Are you using Cisco network switch as network load balance functionality?
    3. How about the Outlook sync from the external?
    Depend on the error message and your test, it’s related to Network issue instead of  Exchange.
    Please try to use Microsoft Network Monitor to get more detail progress of the connection of sync, for more resource: 
    http://www.microsoft.com/en-in/download/details.aspx?id=4865
    Additional, please contact Mobility and ActiveSync Team so that you can get more professional suggestions. For your convenience:
    https://social.technet.microsoft.com/Forums/en-US/home?forum=exchangesvrmobilitylegacy
    Best Regards,
    Allen Wang

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