![Browsing the MOB on ESX 6 displays 503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http20NamedPipeServiceSpecE:0x4bf02038] _serverNamespace = /mob _isRedirect = false _pipeName =/var/run/vmware/proxy -mob) Browsing the MOB on ESX 6 displays 503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http20NamedPipeServiceSpecE:0x4bf02038] _serverNamespace = /mob _isRedirect = false _pipeName =/var/run/vmware/proxy -mob)](https://2.bp.blogspot.com/-HJ8DX__4-7Q/VvVmD_L2nlI/AAAAAAAAA08/_aWltArssiEVKAbIqNJrgfrh0Shn9wlfQ/s1600/503%2BService%2BUnavailable.png)
Browsing the MOB on ESX 6 displays 503 Service Unavailable (Failed to connect to endpoint: [N7Vmacore4Http20NamedPipeServiceSpecE:0x4bf02038] _serverNamespace = /mob _isRedirect = false _pipeName =/var/run/vmware/proxy -mob)
![Cloudflare Proxy] 503 Service Temporarily Available only on POST Requests - DNS & Network - Cloudflare Community Cloudflare Proxy] 503 Service Temporarily Available only on POST Requests - DNS & Network - Cloudflare Community](https://global.discourse-cdn.com/cloudflare/optimized/3X/9/9/9925f9f00fa47ec358b0ae3012a46227f95e2974_2_689x219.png)
Cloudflare Proxy] 503 Service Temporarily Available only on POST Requests - DNS & Network - Cloudflare Community
Problem with authentication to external system. Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable - Salesforce Developer Community
![Why System.CalloutException: Unable to tunnel through proxy. Proxy returns “HTTP/1.1 503 Service Unavailable” occur Why System.CalloutException: Unable to tunnel through proxy. Proxy returns “HTTP/1.1 503 Service Unavailable” occur](https://1.bp.blogspot.com/-s5b_xBfwXCk/YV6sd7WQzlI/AAAAAAAAAwA/1hKT29TB7y090NhChmk_0z0LCucdRWBGwCLcBGAsYHQ/s3217/Screenshot%2B2021-10-07%2Bat%2B1.44.06%2BPM.png)
Why System.CalloutException: Unable to tunnel through proxy. Proxy returns “HTTP/1.1 503 Service Unavailable” occur
503 Service Unavailable from proxy with large number of connections · Issue #4316 · linkerd/linkerd2 · GitHub
![Configure endpoint proxy and Internet connectivity settings - Microsoft Defender for Identity | Microsoft Learn Configure endpoint proxy and Internet connectivity settings - Microsoft Defender for Identity | Microsoft Learn](https://learn.microsoft.com/en-us/defender-for-identity/media/certificate-path.png)
Configure endpoint proxy and Internet connectivity settings - Microsoft Defender for Identity | Microsoft Learn
ERROR] java.io.IOException: Unable to tunnel through proxy. Proxy returns "HTTP/1.1 503 Service Unavailable"Communication exception, Proxy settings might be incorrect" when using the API in the webservice transformation in IICS.
![Cloudflare Proxy] 503 Service Temporarily Available only on POST Requests - DNS & Network - Cloudflare Community Cloudflare Proxy] 503 Service Temporarily Available only on POST Requests - DNS & Network - Cloudflare Community](https://global.discourse-cdn.com/cloudflare/original/3X/c/0/c02b26d279f7e22ed4fbe403e1d8e3182a7c9441.png)