On prem EAC shows in text only on Exchange 2016 after CU20 and KB5001779 install

%3CLINGO-SUB%20id%3D%22lingo-sub-2276257%22%20slang%3D%22en-US%22%3EOn%20prem%20EAC%20shows%20in%20text%20only%20on%20Exchange%202016%20after%20CU20%20and%20KB5001779%20install%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2276257%22%20slang%3D%22en-US%22%3E%3CP%3ELast%20night%20I%20upgraded%20my%20Exchange%202016%20server%20from%20CU18%20to%20CU20%20and%20installed%26nbsp%3BKB5001779.%26nbsp%3B%20Now%20I%20am%20no%20longer%20able%20to%20load%20EAC%20properly.%26nbsp%3B%20It%20just%20shows%20text%20like%20below.%26nbsp%3B%20None%20of%20the%20links%20are%20clickable.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EEnterpriseOffice%20365%3CBR%20%2F%3EDockter%20Admin%3CBR%20%2F%3EMore%E2%96%BC%3CBR%20%2F%3EAnother%20user...%3CBR%20%2F%3ESign%20out%3CBR%20%2F%3EHelpHelp%3CBR%20%2F%3EMore%E2%96%BC%3CBR%20%2F%3EHelp%3CBR%20%2F%3EHelp%20Bubble%3CBR%20%2F%3EShow%20Command%20Logging%3CBR%20%2F%3EPrivacy%3CBR%20%2F%3ECopyright%3CBR%20%2F%3EExchange%20admin%20center%3CBR%20%2F%3Erecipients%3CBR%20%2F%3Epermissions%3CBR%20%2F%3Ecompliance%20management%3CBR%20%2F%3Eorganization%3CBR%20%2F%3Eprotection%3CBR%20%2F%3Email%20flow%3CBR%20%2F%3Emobile%3CBR%20%2F%3Epublic%20folders%3CBR%20%2F%3Eunified%20messaging%3CBR%20%2F%3Eservers%3CBR%20%2F%3Ehybrid%3CBR%20%2F%3Emailboxes%3CBR%20%2F%3Egroups%3CBR%20%2F%3Eresources%3CBR%20%2F%3Econtacts%3CBR%20%2F%3Eshared%3CBR%20%2F%3Emigration%3CBR%20%2F%3E%E2%99%A5%20Feedback%3CBR%20%2F%3E%C3%97%3CBR%20%2F%3ERate%20your%20experience%20with%20Exchange%20admin%20center.%3C%2FP%3E%3CP%3E%3CBR%20%2F%3ELet%20us%20know%20what%20you%20liked%20or%20what%20we%20can%20do%20better.%3C%2FP%3E%3CP%3ETo%20protect%20your%20privacy%2C%20please%20do%20not%20include%20personal%20information%20in%20your%20feedback.%20Review%20our%20privacy%20policy.%3C%2FP%3E%3CP%3E%26nbsp%3B%3C%2FP%3E%3CP%3EIt%20is%20OK%20for%20Microsoft%20to%20contact%20me%20about%20this%20feedback.%3C%2FP%3E%3CP%3E%3CBR%20%2F%3EThank%20you%20for%20your%20feedback!%3C%2FP%3E%3CP%3ESorry%2C%20an%20error%20occurred.%20Please%20try%20again%20later.%3CBR%20%2F%3EInvalid%20Email%3CBR%20%2F%3EALERTS%3CBR%20%2F%3EPlease%20wait...%20Please%20wait...%3CBR%20%2F%3ESome%20alerts%20aren't%20currently%20available.%3C%2FP%3E%3C%2FLINGO-BODY%3E%3CLINGO-LABS%20id%3D%22lingo-labs-2276257%22%20slang%3D%22en-US%22%3E%3CLINGO-LABEL%3E2016%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3EExchange%20Server%3C%2FLINGO-LABEL%3E%3CLINGO-LABEL%3Ehybrid%3C%2FLINGO-LABEL%3E%3C%2FLINGO-LABS%3E%3CLINGO-SUB%20id%3D%22lingo-sub-2402068%22%20slang%3D%22en-US%22%3ERe%3A%20On%20prem%20EAC%20shows%20in%20text%20only%20on%20Exchange%202016%20after%20CU20%20and%20KB5001779%20install%3C%2FLINGO-SUB%3E%3CLINGO-BODY%20id%3D%22lingo-body-2402068%22%20slang%3D%22en-US%22%3EI%20got%20same%20issue.%20Spent%20a%20day%20trying%20to%20figure%20out%20unsuccessfully.%20Did%20you%20ever%20find%20a%20solution%3F%3C%2FLINGO-BODY%3E
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Last night I upgraded my Exchange 2016 server from CU18 to CU20 and installed KB5001779.  Now I am no longer able to load EAC properly.  It just shows text like below.  None of the links are clickable.

 

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2 Replies
I got same issue. Spent a day trying to figure out unsuccessfully. Did you ever find a solution?

@sergemtn Microsoft support had me do the below which fixed the issue.  Both of the scripts are in the BIN folder of the Exchange install directory.

 

Ran updatecas.ps1 & updateconfig.ps1 script

Ran iisreset