KB-2383 Interactive SAIL Examples in Appian Documentation Fail to Execute

pauline.delacruz — Tue, 26 May 2026 16:01:08 GMT

Current Revision posted to Appian Knowledge Base by pauline.delacruz on 5/26/2026 4:01:08 PM

Symptoms

Interactive SAIL expression examples embedded in Appian documentation pages fail to execute. The browser displays the following error message:

The connection is blocked because it was initiated by a public page to connect to devices or servers on your local network.

This issue occurs in networks where the AWS API Gateway endpoint used by the documentation resolves to a private IP address.

Cause

Appian documentation pages use an AWS API Gateway endpoint with the domain *.execute-api.us-east-1.amazonaws.com to support execution of SAIL expressions. In enterprise networks AWS service endpoints may resolve to a private IP address. Modern browsers block requests where the originating page is treated as public and the target endpoint resolves to a private or local IP address. This is intentional browser behavior designed to prevent DNS rebinding and local network attacks.

Action

This is a known limitation that affects enterprise networks with private AWS networking configurations. Appian has added an enhancement to the documentation backlog to address this issue (Reference ticket: LCP-49998). No estimated time of availability is currently provided for this enhancement.

Workaround

Organizations may allow *.execute-api.us-east-1.amazonaws.com domains to resolve using public DNS controls to ensure the page loads properly.

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: May 2026

Tags: web browser, infrastructure, Cloud

[DRAFT SUPP-2640] Interactive SAIL Examples in Appian Documentation Fail to Execute

pauline.delacruz — Wed, 20 May 2026 19:06:41 GMT

Revision 7 posted to Appian Knowledge Base by pauline.delacruz on 5/20/2026 7:06:41 PM

Symptoms

Interactive SAIL expression examples embedded in Appian documentation pages fail to execute. The browser displays the following error message:

The connection is blocked because it was initiated by a public page to connect to devices or servers on your local network.

This issue occurs in networks where the AWS API Gateway endpoint used by the documentation resolves to a private IP address.

Cause

Action

Workaround

Organizations may allow *.execute-api.us-east-1.amazonaws.com domains to resolve using public DNS controls to ensure the page loads properly.

Affected Versions

This article applies to all versions of Appian.

Last Reviewed: May 2026

Tags: web browser, infrastructure, Cloud

[DRAFT SUPP-2640] Interactive SAIL Examples in Appian Documentation Fail to Execute

Zack Mateja — Wed, 20 May 2026 18:58:57 GMT

Revision 6 posted to Appian Knowledge Base by Zack Mateja on 5/20/2026 6:58:57 PM

Symptoms

Interactive SAIL expression examples embedded in Appian documentation pages fail to execute. The browser displays the following error message:

The connection is blocked because it was initiated by a public page to connect to devices or servers on your local network.

This issue occurs in networks where the AWS API Gateway endpoint used by the documentation resolves to a private IP address.

Cause

Appian documentation pages use an AWS API Gateway endpoint with the domain *.execute-api.us-east-1.amazonaws.com to support execution of SAIL expressions. In enterprise networks AWS service endpoints may resolve to a private IP address. Modern browsers block requests where the originating page is treated as public and the target endpoint resolves to a private or local IP address. This is intentional browser behavior designed to prevent DNS rebinding and local network attacks.

Action

Workaround

Organizations may allow *.execute-api.us-east-1.amazonaws.com domains to resolve using public DNS controls to ensure the page loads properly.

Last Reviewed: May 2026

Tags: web browser, infrastructure, Cloud

[DRAFT SUPP-2640] Interactive SAIL Examples in Appian Documentation Fail to Execute

Zack Mateja — Wed, 20 May 2026 15:36:33 GMT

Revision 5 posted to Appian Knowledge Base by Zack Mateja on 5/20/2026 3:36:33 PM

Symptoms

Interactive SAIL expression examples embedded in Appian documentation pages fail to execute. The browser displays the following error message:

The connection is blocked because it was initiated by a public page to connect to devices or servers on your local network.

This issue occurs in networks where the AWS API Gateway endpoint used by the documentation resolves to a private IP address.

Cause

Action

Workaround

Organizations may allow *.execute-api.us-east-1.amazonaws.com domains to resolve using public DNS controls to ensure the page loads properly.

Last Reviewed: May 2026

Tags: web browser, infrastructure, Cloud

[DRAFT SUPP-2640] Using Interactive SAIL Boxes in Appian Documentation

Zack Mateja — Wed, 20 May 2026 15:35:59 GMT

Revision 4 posted to Appian Knowledge Base by Zack Mateja on 5/20/2026 3:35:59 PM

Interactive SAIL Examples in Appian Documentation Fail to Execute

Symptoms

Interactive SAIL expression examples embedded in Appian documentation pages fail to execute. The browser displays the following error message:

The connection is blocked because it was initiated by a public page to connect to devices or servers on your local network.

This issue occurs in networks where the AWS API Gateway endpoint used by the documentation resolves to a private IP address.

Cause

Action

Workaround

Organizations may allow *.execute-api.us-east-1.amazonaws.com domains to resolve using public DNS controls to ensure the page loads properly.

Last Reviewed: May 2026

Tags: web browser, infrastructure, Cloud

[DRAFT SUPP-2640] Using Interactive SAIL Boxes in Appian Documentation

Zack Mateja — Wed, 20 May 2026 15:35:42 GMT

Revision 3 posted to Appian Knowledge Base by Zack Mateja on 5/20/2026 3:35:42 PM

Interactive SAIL Examples in Appian Documentation Fail to Execute

Symptoms

Interactive SAIL expression examples embedded in Appian documentation pages fail to execute. The browser displays the following error message:

The connection is blocked because it was initiated by a public page to connect to devices or servers on your local network.

This issue occurs in networks where the AWS API Gateway endpoint used by the documentation resolves to a private IP address.

Cause

Action

Workaround

Organizations may allow *.execute-api.us-east-1.amazonaws.com domains to resolve using public DNS controls to ensure the page loads properly.

Preventative Actions

Be aware that interactive SAIL execution examples in Appian documentation rely on direct client-side calls to *.execute-api.amazonaws.com. These examples may fail in environments where those domains resolve privately or are blocked by the browser due to enterprise DNS and security configurations.

Last Reviewed: May 2026

Tags: web browser, infrastructure, Cloud

[DRAFT SUPP-2640] Using Interactive SAIL Boxes in Appian Documentation

Zack Mateja — Wed, 20 May 2026 15:35:09 GMT

Revision 2 posted to Appian Knowledge Base by Zack Mateja on 5/20/2026 3:35:09 PM

Interactive SAIL Examples in Appian Documentation Fail to Execute

Symptoms

Interactive SAIL expression examples embedded in Appian documentation pages fail to execute. The browser displays the following error message:

The connection is blocked because it was initiated by a public page to connect to devices or servers on your local network.

This issue occurs in networks where the AWS API Gateway endpoint used by the documentation resolves to a private IP address.

Cause

Action

This is a known limitation that affects enterprise networkswith private AWS networking configurations. Appian has added an enhancement to the documentation backlog to address this issue (Reference ticket: LCP-49998). No estimated time of availability is currently provided for this enhancement.

Workaround

Organizations may allow *.execute-api.us-east-1.amazonaws.com domains to resolve using public DNS controls to ensure the page loads properly.

Preventative Actions

Last Reviewed: May 2026

Tags: web browser, infrastructure, Cloud

[KB-XXXX] SUPP-2640 Insert title here

Ryan Good — Tue, 28 Apr 2026 17:26:19 GMT

Revision 1 posted to Appian Knowledge Base by Ryan Good on 4/28/2026 5:26:19 PM

https://community.appian.com/solution-engineering/w/internal-knowledge-base/725/int-0000-how-to-write-kb-articles