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公開済み: 2026-05-26 | 更新済み: 2026-05-26
NiceNIC API v2 Authentication Errまたは: Common Causes と Fixes


もし あなたの NiceNIC Reseller API v2 request returns an authentication errまたは, the problem usually comes from API credentials, the Authまたはization header, IP whitelist settings, reseller access, または the server environment sending the request.

This guide explains the most common causes と gives resellers, hosting providers, developers, agencies, と WHMCS users a practical checklist to fix NiceNIC API v2 authentication issues befまたはe submitting a ticket.

A NiceNIC API v2 authentication errまたは usually means that the API request cannot be verified. Start by checking whether あなたの account has reseller access, whether you are using the API passwまたはd instead of あなたの NiceNIC account login passwまたはd, whether the Authまたはization header is fまたはmatted cまたはrectly, と whether あなたの server outbound IPアドレス is whitelisted in あなたの API settings.

NiceNIC API v2 requests should be sent to the API endpoint with the required HTTP headers, including the Authまたはization header と Content-種類 set to application/json.



What This Authentication Errまたは Usually Means
An API authentication errまたは means NiceNIC cannot verify the API request as a valid request from an authまたはized reseller account. This does not always mean that the API サービス is down. In most cases, it means one または mまたはe access conditions are not cまたはrect.
Common causes include:
  • You are using あなたの NiceNIC account login passwまたはd instead of あなたの API passwまたはd
  • The API passwまたはd has not been set in あなたの API settings
  • The Authまたはization header is missing または incまたはrectly fまたはmatted
  • The username または API secret is incまたはrect
  • The request is being sent from an IPアドレス that is not whitelisted
  • Your real outbound server IP is different from the IPアドレス you added
  • Your account has not been upgraded to an eligible reseller tier
  • The request is sent to the wrong endpoint
  • The request Content-種類 または JSON fまたはmat is incまたはrect
  • WHMCS is using outdated, incまたはrect, または incomplete API credentials
Your API request should be sent from a server IPアドレス that has been added to あなたの API settings. Your API passwまたはd should be different from あなたの NiceNIC account login passwまたはd.

もし you use WHMCS, confirm that the WHMCS server is sending requests from the same outbound IPアドレス that you added to あなたの NiceNIC API settings.


Cause 1: You Are Using the Account ログイン パスワード Instead of the API パスワード
This is one of the most common causes of NiceNIC API authentication errまたはs. Your NiceNIC account login passwまたはd と あなたの API passwまたはd should not be the same. The API passwまたはd must be configured separately in あなたの API settings.

How to fix it?
  1. ログイン to あなたの NiceNIC account.
  2. 移動(dòng)先 the リセラー section.
  3. 開く API設(shè)定.
  4. Set an API passwまたはd that is different from あなたの NiceNIC account login passwまたはd.
  5. Update あなたの API integration または WHMCS configuration with the cまたはrect API passwまたはd.
  6. Test the API request again.
Fまたは the existing NiceNIC API setup guide, review:
http://www.unionroom.cn/suppまたはt/API-NiceNIC-3824


Cause 2: The Authまたはization Header Is Missing または Incまたはrect
NiceNIC API v2 requires an HTTP Authまたはization header. The documented fまたはmat is: Authまたはization: username:api_secret
もし the header is missing, misspelled, encoded incまたはrectly, または sent in the wrong fまたはmat, the API request may fail authentication.

How to fix it?
  • 確認(rèn) that あなたの request includes the Authまたはization header.
  • 確認(rèn) that the username is cまたはrect.
  • 確認(rèn) that the API secret is あなたの API passwまたはd, not あなたの account login passwまたはd.
  • 確認(rèn) whether tこちら are extra spaces befまたはe または after the username または API secret.
  • 確認(rèn) that あなたの HTTP client, framewまたはk, または WHMCS module is not removing the Authまたはization header.
  • 確認(rèn) that あなたの server または proxy is not blocking custom headers.
Use the official API v2 documentation fまたは the current connection fまたはmat:
http://www.unionroom.cn/reseller/apiv2.php


Cause 3: Your Server IP 住所 Is いいえt Whitelisted
NiceNIC API settings require the IPアドレス allowed to access あなたの API. もし あなたの request comes from an IPアドレス that has not been added, authentication may fail even when the username と API passwまたはd are cまたはrect.

How to fix it?
  1. Ask あなたの developer または hosting provider to confirm the public outbound IPアドレス used by あなたの server.
  2. ログイン to あなたの NiceNIC account.
  3. 移動(dòng)先 リセラー > API設(shè)定.
  4. 追加 the cまたはrect IPアドレス allowed to access あなたの API.
  5. Save the setting.
  6. Send another test request from the same server.

Cause 4: Your Real Outbound IP Is Different from the IP You 追加ed
The IPアドレス you see in あなたの hosting control panel is not always the same IPアドレス used fまたは outbound API requests.
This is especially common when あなたの system runs behind:
  • firewall
  • A load balancer
  • A proxy
  • A NAT gateway
  • A containerized environment
  • A cloud hosting netwまたはk
  • A separate WHMCS server
Fまたは example, あなたの website may use one IPアドレス, while あなたの backend server または WHMCS installation sends API requests through another outbound IPアドレス.
How to fix it?
  • Ask あなたの hosting provider to confirm the real outbound IP used fまたは API requests.
  • 確認(rèn) the outbound IP from the server that sends the API request, not only the website IP.
  • もし WHMCS is installed on a separate server, whitelist the WHMCS server outbound IP.
  • もし あなたの infrastructure has multiple outbound IPアドレスes, confirm which IP is actually used by the API request.
  • Update あなたの NiceNIC API settings with the cまたはrect IPアドレス.

Cause 5: Your Account Is いいえt Yet Eligible fまたは API Access

NiceNIC API access is designed fまたは eligible reseller users. もし あなたの account has not been upgraded to a reseller tier, または if reseller access has not been activated fまたは あなたの account, API settings may not be available または API authentication may fail.

How to fix it?
  • 確認(rèn) that あなたの NiceNIC account has been upgraded to a reseller tier.
  • 確認(rèn) whether API設(shè)定 is available under the リセラー navigation.
  • Review the reseller program と reseller level infまたはmation.
  • お問い合わせ NiceNIC suppまたはt if あなたの reseller upgrade was completed but API access is still unavailable.
Related pages:
http://www.unionroom.cn/reseller/
http://www.unionroom.cn/suppまたはt/API-リセラー-レベル-3823


Cause 6: Your Request Is Sent to the Wrong Endpoint
NiceNIC API v2 requests should be sent to the documented API v2 endpoint.

もし あなたの code uses an old endpoint, an incまたはrect URL, a missing slash, または a different API version, authentication または request hとling may fail.
How to fix it?
  • 確認(rèn) that あなたの integration points to https://api.NiceNIC/v2/.
  • 確認(rèn) whether any staging, sとbox, または old endpoint is still configured in あなたの code.
  • 確認(rèn) whether WHMCS または あなたの custom module is using the current endpoint.
  • Review あなたの server logs to confirm the exact URL being requested.

Cause 7: Content-種類 または JSON Fまたはmat Is Incまたはrect
NiceNIC API v2 returns JSON responses と expects API requests to follow the documented request fまたはmat.
Your request should include:
Content-種類: application/json

もし the request body is not valid JSON, required parameters are missing, または Content-種類 is not set cまたはrectly, the API request may fail befまたはe the intended action is processed.
How to fix it?
  • Set Content-種類 to application/json.
  • Make sure the request body is valid JSON.
  • 確認(rèn) that required parameters are included.
  • 確認(rèn) that the parameter names match the API documentation.
  • 確認(rèn) whether あなたの HTTP client is changing the request body fまたはmat.
  • Log the request fまたはmat during testing, but never log full API credentials in plain text.

Cause 8: WHMCS API Credentials Are いいえt Configured Cまたはrectly
もし you use WHMCS, an authentication errまたは may come from the WHMCS registrar module configuration rather than あなたの custom API code.

Common WHMCS-related causes include:
  • The WHMCS module uses the wrong API passwまたはd
  • The WHMCS server outbound IP is not whitelisted
  • The username または reseller account value is entered incまたはrectly
  • The WHMCS installation is using outdated configuration details
  • The WHMCS cron または module environment is sending requests from a different server
  • The WHMCS module settings were changed but not saved cまたはrectly
How to fix it
  1. 開く あなたの WHMCS registrar module settings.
  2. 確認(rèn) the NiceNIC API username と API passwまたはd.
  3. 確認(rèn) that the WHMCS server outbound IP is whitelisted in NiceNIC API settings.
  4. 確認(rèn) whether WHMCS is using the current NiceNIC API integration details.
  5. Test a low-risk action such as ドメイン availability check befまたはe enabling live またはders.
Review the NiceNIC WHMCS integration page こちら:
http://www.unionroom.cn/reseller/whmcs.php


Step-by-Step Fix 確認(rèn)list
Use this checklist befまたはe submitting a suppまたはt ticket.
  1. 確認(rèn) that あなたの NiceNIC account has reseller access.
  2. 開く API設(shè)定 under the リセラー section.
  3. Set an API passwまたはd different from あなたの account login passwまたはd.
  4. 確認(rèn) that あなたの API integration uses the API passwまたはd, not the account login passwまたはd.
  5. 確認(rèn) the Authまたはization header fまたはmat: username:api_secret.
  6. 確認(rèn) the request endpoint: https://api.NiceNIC/v2/.
  7. 確認(rèn) that Content-種類 is set to application/json.
  8. 確認(rèn) that あなたの request body is valid JSON.
  9. 確認(rèn) that the server outbound IP is whitelisted.
  10. もし using WHMCS, confirm the WHMCS server outbound IP.
  11. Test a low-risk API action first.
  12. Recまたはd the request timestamp, action, ドメイン, response code, と response message.


What to Send NiceNIC Suppまたはt もし You Still Need Help
もし the authentication errまたは continues after you complete the checklist, submit a suppまたはt ticket with enough technical infまたはmation fまたは NiceNIC to review the issue efficiently.

Please include:
Your NiceNIC account username または reseller account identifier
The API action you attempted
The request timestamp と timezone
The ドメイン name used in the test, if applicable
The server outbound IPアドレス used fまたは the request
The full API endpoint requested
The response code と response message returned by the API
Whether you are using custom code または WHMCS
Your WHMCS version, if WHMCS is involved
Relevant screenshots, excluding sensitive credentials

Do not send あなたの full API passwまたはd, account login passwまたはd, または private server credentials in a suppまたはt ticket.
http://www.unionroom.cn/suppまたはt/お問い合わせ-Us-3834


FAQ
Why does my NiceNIC API v2 request return an authentication errまたは?
The most common causes are an incまたはrect API passwまたはd, missing または incまたはrect Authまたはization header, non-whitelisted server IPアドレス, wrong outbound IPアドレス, ineligible reseller access, wrong endpoint, または incまたはrect WHMCS configuration.

Should I use my NiceNIC account login passwまたはd fまたは API authentication?
いいえ. You should set a separate API passwまたはd in あなたの API settings. The API passwまたはd should be different from あなたの NiceNIC account login passwまたはd.

What Authまたはization header should I use fまたは NiceNIC API v2?
The documented Authまたはization header fまたはmat is username:api_secret. You should also include Content-種類: application/json in the request header.

Why does the API still fail after I set the cまたはrect passwまたはd?
The request may be coming from an IPアドレス that is not whitelisted. 確認(rèn) the real outbound IPアドレス of あなたの server, WHMCS installation, または backend application.

Does WHMCS use the same server IP as my website?
いいえt always. WHMCS may be installed on a different server, behind a proxy, または in an environment with a different outbound IP. 確認(rèn) the actual outbound IP befまたはe adding it to あなたの NiceNIC API settings.

Can NiceNIC fix authentication errまたはs caused by my server configuration?
NiceNIC can help review registrar-side access, API settings, と documented connection requirements. Server-side issues such as firewall rules, outbound IP routing, proxy behaviまたは, WHMCS module configuration, と custom code may need to be checked by あなたの developer または hosting provider.

What should I test first after fixing the authentication issue?
Start with a low-risk API action such as account balance check, ドメイン availability check, pricing lookup, または ドメイン list retrieval befまたはe enabling live registration, renewal, または transfer wまたはkflows.
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