Forum Discussion

Ahmed_Galal's avatar
Ahmed_Galal
Icon for Cirrostratus rankCirrostratus
Nov 28, 2019

MS OWA not working after deploying ASM

Hi all,

 

i have applied ASM Policy template for OWA Exchange every thing works perfect but MS outlook is not working.

 

event log that all exchange.asmx and rpcproxy.dll that with cookies outlook session returns back with response code 401 and action not accepted although that it is legal traffic.

 

any idea??

application delivery
ASM Advanced WAF
  • Ahmed_Galal's avatar
    Ahmed_Galal
    Dec 03, 2019

    via iApp and i have used F5 ASM template for exchange 2016. i have found an artical saying that RPC is originally binary traffic and it should be excluded from ASM so i made iRule to excluded RPC over HTTP traffic then it works perfect.

     

    thanks boneyard for your response.

  • boneyard's avatar
    boneyard
    Icon for MVP rankMVP
    Nov 30, 2019

    so for example owa works but the outlook full client doesnt?

     

    check the ASM event log, is traffic blocked?

     

    • Ahmed_Galal's avatar
      Ahmed_Galal
      Icon for Cirrostratus rankCirrostratus
      Dec 01, 2019

      no traffic not blocked, traffic is legal but outlook sessions returns with response code 401 and not accepted.

      • boneyard's avatar
        boneyard
        Icon for MVP rankMVP
        Dec 01, 2019

        for reference which version tmos (big-ip) and exchange?

         

        how did you set this up? did you have exchange load balanced via an iApp or manual?

         

        how did you now enable ASM? via which template option?

  • aremondini's avatar
    aremondini
    Icon for Nimbostratus rankNimbostratus
    Mar 05, 2021

    You can find a workaround in this article:

    https://support.f5.com/csp/article/K40345000