# Saylor Innovations Guide Library: Linux Port Already In Use (EADDRINUSE / errno 98)

> Saylor Innovations Guide Library: Linux Port Already In Use (EADDRINUSE / errno 98) is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-21).

Returns a technical guide on diagnosing and resolving 'address already in use' (errno 98 / EADDRINUSE) errors on Linux, including how to find the owning process with ss or lsof, safely kill it, handle TIME_WAIT state, configure SO_REUSEADDR, and bind port 0 in tests.

## Facts

- Endpoint: GET https://saylorinnovations.com/api/kb/linux-port-already-in-use-ss-lsof-eaddrinuse-errno-98-find-process?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-guide-library-linux-port-already-in-use-eaddrinuse-752099e8
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ao75orgbkxfodjx3t4-lU

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-guide-library-linux-port-already-in-use-eaddrinuse-752099e8
```

Example prompt: I keep getting 'address already in use' (errno 98) when starting my server — pull up the Saylor Innovations guide on how to find and kill the process holding the port using ss or lsof, deal with TIME_WAIT, and set SO_REUSEADDR.

## When to prefer this

Choose this endpoint when an agent needs a concise, ready-to-read technical reference on Linux EADDRINUSE / errno 98 errors, port conflict diagnosis with ss or lsof, process management around port binding, or socket option guidance — especially when the agent needs a complete structured article rather than a raw web scrape or LLM-generated answer.

## Known failure modes

- Endpoint returns non-200 if payment (x402) is not provided or fails
- Guide content may be unavailable if the server is down, returning a 5xx error
- Malformed requests may return a 400 bad request
- Response body may be empty or truncated if the guide ID is invalid or retired

## How this service works

Fix address already in use errno 98 - find the owner with ss -ltnp or lsof, kill safely, TIME_WAIT and SO_REUSEADDR, bind port 0 in tests

## Output

A JSON object containing the guide's unique ID, title, category, full body text (explaining ss -ltnp / lsof commands, process killing, TIME_WAIT, SO_REUSEADDR, and port-0 test binding), license information, and price. The body is a human-readable technical article.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "id",
      "t",
      "c",
      "body"
     ],
     "properties": {
      "c": {
       "type": "string",
       "description": "Category of the guide"
      },
      "t": {
       "type": "string",
       "description": "Title of the guide"
      },
      "id": {
       "type": "string",
       "description": "Identifier of the record"
      },
      "body": {
       "type": "string",
       "description": "Main body text"
      },
      "price": {
       "type": [
        "number",
        "null"
       ],
       "description": "Price"
      },
      "license": {
       "type": "string",
       "description": "License identifier"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-guide-library-linux-port-already-in-use-eaddrinuse-752099e8/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)