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I am using ArcMap 10.3.1 and trying to make a connection with federated ArcGIS Server 10.6.1.
I am Getting this error message:
We were unable to connect to:
http://arcgisserver:6443/arcgis. Error : Bad syntax in request. (status code 400)
What could the problem be?
From the ArcGIS manual About Connecting to ArcGIS Server in ArcGIS for Desktop:
Specifying the server URL Specifying the server URL When you connect, you'll be asked to type the URL to your ArcGIS Server site. For user connections, you'll often include the name of the ArcGIS Web Adaptor in your URL. This will look like http://webadaptorhost.domain.com/webadaptorname/services.
For publisher and administrative connections, access through the web adaptor is blocked by most organizations. Instead, you need to use the administrative URL of the server, which takes the format http://gisserver.domain.com:6080/arcgis.
Some sites may require an HTTPS connection through port 6443. Check with your server administrator if you are unsure of the appropriate URL to use.
If you receive an error when connecting, one of more of the following may be the cause:
- You typed an incorrect name or password.
- You did not use your server’s expected protocol of HTTP or HTTPS.
- You did not include the fully qualified domain name of the server (which is required in scenarios where the server is federated with Portal for ArcGIS).
It is worth also to read the Compatibility of ArcGIS for server with earlier versions
Can I view and use my 10.6.1 services within an earlier version of ArcGIS Desktop?
You can add 10.6.1 services to earlier versions of ArcGIS Desktop and use them in the same way that you used them in the past, including as a layer in ArcMap. However, if your ArcGIS Server10.6.1 site is federated with Portal for ArcGIS and the portal is configured with Security Assertion Markup Language (SAML), you must at least use ArcGIS Desktop 10.3.
If your 10.6.1 ArcGIS Server site is federated with Portal for ArcGIS and you are connecting from a pre-10.2 version of ArcGIS Desktop, you must access your services through ArcMap using Add Data > Add Data from Portal for ArcGIS. You cannot connect to the server by clicking Add ArcGIS Server.
Can the problem be that you are using http to access a port that requires https?
https://enterprise.arcgis.com/en/server/latest/install/windows/ports-used-by-arcgis-server.htm
Normally it should default to 6443 when you use https. Do you get the same error if you try https://arcgisserver/arcgis?
Your connection string starts with HTTP, but port 6443 works just for HTTPS. For HTTP use port 6080.
