{"id":104606,"date":"2026-06-24T10:05:00","date_gmt":"2026-06-24T04:35:00","guid":{"rendered":"https:\/\/yourwebsite.com\/?p=2"},"modified":"2026-06-24T10:05:00","modified_gmt":"2026-06-24T04:35:00","slug":"error-1152","status":"publish","type":"post","link":"https:\/\/seminarsonly.com\/news\/error-1152\/","title":{"rendered":"Resolving Gemini Error 1152: IAM Permissions and Access Control"},"content":{"rendered":"<div style=\"background-color: #e8f4f8; padding: 20px; border-left: 6px solid #005A9C; margin-bottom: 25px;\">\n<h3 style=\"color: #005A9C; margin-top:0;\">Quick Answer<\/h3>\n<p><strong>Error 1152<\/strong> is a strict Identity and Access Management (IAM) rejection. It occurs when the authenticated service account or user identity attempts to execute a Gemini model inference without the required <em>Vertex AI User<\/em> role. Resolve this by navigating to your GCP IAM &#038; Admin dashboard and assigning the <em>roles\/aiplatform.user<\/em> permission to the executing identity.<\/p>\n<\/div>\n<p>Security perimeters are vital for cloud-based AI infrastructure. When you encounter Error 1152, the system successfully identified who you are, but determined you are not on the guest list for the specific action requested. Unlike <a href=\"\/news\/error-1100-gemini\/\" style=\"color: #005A9C;\">Error 1100<\/a> which often deals with quotas or API key expiration, 1152 is purely about Role-Based Access Control (RBAC).<\/p>\n<h2 style=\"color: #2C3E50;\">Core Mechanics of Error 1152<\/h2>\n<p>Enterprise AI deployments isolate resources to prevent lateral movement in the event of a breach. If a developer provisions a new service account for a web application but forgets to grant it AI platform access, the API gateway will immediately return code 1152 upon the first prompt request.<\/p>\n<ul>\n<li><strong>Missing Roles:<\/strong> The identity is missing <em>roles\/aiplatform.user<\/em> or a custom role with equivalent endpoint permissions.<\/li>\n<li><strong>Cross-Project Boundaries:<\/strong> The identity resides in Project A, but is attempting to invoke a Gemini endpoint hosted in Project B without cross-project IAM bindings.<\/li>\n<li><strong>VPC Service Controls:<\/strong> Network perimeters are blocking the identity from accessing the API, even if IAM roles are technically correct.<\/li>\n<\/ul>\n<h2 style=\"color: #2C3E50;\">Step-by-Step IAM Remediation<\/h2>\n<p>To safely restore access without violating principle-of-least-privilege, follow these structured deployment commands or UI steps.<\/p>\n<table style=\"border-collapse: collapse; width: 100%; border: 1px solid #d3dce6; margin-bottom: 25px; font-family: sans-serif;\">\n<tr style=\"background-color: #2C3E50; color: #ffffff;\">\n<th style=\"padding: 12px; border: 1px solid #d3dce6; text-align: left;\">Environment<\/th>\n<th style=\"padding: 12px; border: 1px solid #d3dce6; text-align: left;\">Action Required<\/th>\n<th style=\"padding: 12px; border: 1px solid #d3dce6; text-align: left;\">Target Outcome<\/th>\n<\/tr>\n<tr style=\"background-color: #f8fafc;\">\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">GCP Console UI<\/td>\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">Go to IAM > Edit Principal > Add &#8220;Vertex AI User&#8221;<\/td>\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">Immediate UI access granted.<\/td>\n<\/tr>\n<tr style=\"background-color: #ffffff;\">\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">gCloud CLI<\/td>\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">gcloud projects add-iam-policy-binding&#8230;<\/td>\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">Programmatic policy update.<\/td>\n<\/tr>\n<tr style=\"background-color: #f8fafc;\">\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">Terraform<\/td>\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">Add google_project_iam_member resource<\/td>\n<td style=\"padding: 12px; border: 1px solid #d3dce6;\">Infrastructure as Code alignment.<\/td>\n<\/tr>\n<\/table>\n<h2 style=\"color: #2C3E50;\">Architectural Best Practices<\/h2>\n<p>Do not attempt to fix Error 1152 by assigning <em>Owner<\/em> or <em>Editor<\/em> roles to your service account. This expands the attack surface unnecessarily. Always use predefined AI roles. If your application starts encountering throttling after fixing the permissions, refer to our <a href=\"\/news\/error-1153-gemini\/\" style=\"color: #005A9C;\">Error 1153 documentation<\/a> to optimize payload throughput.<\/p>\n<p style=\"text-align: center; margin-top: 30px; margin-bottom: 30px;\">\n    <a href=\"https:\/\/cloud.google.com\/iam\/docs\" style=\"background-color: #27AE60; color: #ffffff; padding: 12px 24px; text-decoration: none; border-radius: 4px; font-weight: bold; display: inline-block;\">Review IAM Documentation<\/a>\n<\/p>\n<div style=\"background-color: #e9f7ef; padding: 20px; border-radius: 6px; margin-top: 35px;\">\n<h3 style=\"color: #27AE60; margin-top:0;\">TL;DR<\/h3>\n<p>Error 1152 is an IAM authorization failure. Ensure that the service account or API key executing the Gemini request possesses the specific <em>Vertex AI User<\/em> role within the target Google Cloud project to immediately bypass this access restriction.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Quick Answer Error 1152 is a strict Identity and Access Management (IAM) rejection. It occurs when the authenticated service account or user identity attempts to execute a Gemini model inference&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","footnotes":""},"categories":[6048],"tags":[],"class_list":["post-104606","post","type-post","status-publish","format-standard","hentry","category-error-fix"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.7 (Yoast SEO v27.7) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Resolving Error 1152: Gemini IAM Permissions Fix<\/title>\n<meta name=\"description\" content=\"Fix Error 1152 by correcting your IAM roles. 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