I can login to EWS on the client but not on the server.

gihyun Park 65

I tried login to EWS(Virtual directory URL set in ECP) on the client PC

and It succeeded in logging in.

I tried login to EWS on the Exchange Server

and it failed in logging in

what is the problem?

used same account, same browser, Verify that i connected to the server with IISlog(set hosts file)

Aholic Liang-MSFT 13,841 Reputation points Microsoft Vendor

2023-07-05T06:40:20.8133333+00:00
Hi @ gihyun Park ，

For further troubleshooting, I would like to confirm the following:

What version of Exchange Server is in your environment? How many are there?

What is the result of running this command? Are the URLs of internal and external consistent?
Get-WebServicesVirtualDirectory | fl server, Name, *URL*, *auth*, MRSProxyEnabled

When EWS access fails, is the relevant error message logged in the IIS log?

In addition, please refer to the following URLs to connect to EWS to see how it results?

https:// <fqdn>:444/ews/exchange.asmx

https:// <localhost>:444/ews/exchange.asmx

https:// <servername>:444/ews/exchange.asmx
gihyun Park 65 Reputation points

2023-07-05T07:53:52.6266667+00:00
Hi @Aholic Liang-MSFT

Thanks for reply

What version of Exchange Server is in your environment? How many are there?
Exchange server 2019 / There is no user cause it is test server

What is the result of running this command? Are the URLs of internal and external consistent?
The URL and method are the same as the Internal and External
WSSecurityAuthentication : True
LiveIdBasicAuthentication : False
BasicAuthentication : False
DigestAuthentication : False
WindowsAuthentication : True
OAuthAuthentication : True
AdfsAuthentication : False
MRSProxyEnabled : False

When EWS access fails, is the relevant error message logged in the IIS log?
The 401 error log is logged in IIS Log

In addition, please refer to the following URLs to connect to EWS to see how it results?

All accessible Login also.

Just The page of the Virtual URL is connected, but NTLM is not access.

Why is it possible on the client and not on the server when accessing the same thing?

Thanks
Aholic Liang-MSFT 13,841 Reputation points Microsoft Vendor

2023-07-10T09:57:34.62+00:00

All accessible Login also.

Can all access from Exchange Server log in?
Aholic Liang-MSFT 13,841 Reputation points Microsoft Vendor

2023-07-18T08:49:07.6066667+00:00

It has been a few days and I am checking in to see how things are going on with this issue. Do you perhaps have any further concerns or questions?It has been a few days and I am checking in to see how things are going on with this issue. Do you perhaps have any further concerns or questions?
gihyun Park 65 Reputation points

2023-07-19T07:18:52.8833333+00:00

I haven't solved it yet.

and

'All accessible Login also' meant that all URL was accessible except virtual URL

Virtual URL can also be accessed. NTLM is not accessible Even if use the same account
Aholic Liang-MSFT 13,841 Reputation points Microsoft Vendor

2023-07-21T09:59:26.37+00:00

If possible, please provide relevant screenshots of success or failure so that we can better understand your issue.
gihyun Park 65 Reputation points

2023-07-24T05:23:06.74+00:00

Clinet PC

Hosts file set

Try to access EWS

Successful connection

Server PC

Try to access EWS

Authentication failed

Try with FQDN URL, Local Host, Server Name

Successful connection

Virtual Directory Set

Thank you for your reply
Aholic Liang-MSFT 13,841 Reputation points Microsoft Vendor

2023-07-25T09:43:36.5066667+00:00

Hi，

Please set this entry in the server's hosts file and see if any changes have changed:

Then please also share the complete entry of the 401 error after hiding the personal information.
Aholic Liang-MSFT 13,841 Reputation points Microsoft Vendor

2023-07-31T09:30:38.6466667+00:00

Hi， It has been a few days and I am checking in to see how things are going on with this issue. Do you perhaps have any further concerns or questions?
gihyun Park 65 Reputation points

2023-08-04T06:57:10.7833333+00:00

Hi

I don't know which one I should change the hosts file to, but if I change it, it applies well.

And attaching the log of IIS default.

Thanks!

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I can login to EWS on the client but not on the server.

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