Zoho Projects Webhook fails with HTTP Error 0

Zoho Projects Webhook fails with HTTP Error 0

Hello Zoho Community,
I am pulling my hair out over this one. I have setup a very basic http(s) server that always responds "ok" and code 200 to incoming GET requests. It will accept any parameters, and any path. Really, all it does is say "ok," and log the request to the server.

This service works great from web browsers, from CURL, and from postman. I've tested it in a lot of places with a lot of GET parameters.

However, when I plug this URL as a Zoho Projects Webhook, Zoho fails. Zoho complains for HTTP Error 0.
Error 0 usually means 
 - client (zoho) error 
 - client (zoho) firewall blocking or filtering request
 - request was cancelled by client code
 - other client error

Has anyone run into this error before?

Is there a blacklist at Zoho I might be on? Or do I need to be explicitly whitelisted?

I have tried Zoho with both http and https, neither succeeds.

Any input is greatly appreciated.



    • Recent Topics

    • Using gift vouchers

      We would like to be able to offer a limited number of gift vouchers, of varying values, to our customers, and are looking for the best way to do this. We have looked at Coupons and Gift Certificates, but neither seem to fit the bill perfectly. Coupons:
    • Email Address for Contact not Populating

      When I click "Send Mail" from a Contact's page, their email address does not auto populate the "To" field. How do I make this happen?
    • الخصم على مستوى فاتورة المبيعات

      السلام عليكم ورحمة الله وبركاته مطلوب في إنشاء خصم على مستوى فاتورة المبيعات وليس على مستوى البند أريد معرفة الطريقة؟
    • Assign Income to Project Without Invoice

      Hello, Fairly new user here so apologies if there is a really obvious solution here that I am just missing... I have hundreds of small deposits into a bank account that I want to assign to a project but do not want to have to create an invoice every time
    • Support for Custom Fonts in Zoho Recruit Career Site and Candidate Portal

      Dear Zoho Recruit Team, I hope you're doing well. We would like to request the ability to use custom fonts in the Zoho Recruit Career Site and Candidate Portal. Currently only the default fonts (Roboto, Lato, and Montserrat) are available. While these
    • Seeking help to be able to search on all custom functions that are defined

      Hello I have a lot of custom functions defined (around 200) and i would like to search some specific strings in the content of those. Is there a way to accomplish that? If not, is there a way to download all existing custom functions in some files locally
    • VAT and Taxes option not available

      Dear ZOHO Team , The VAT and Taxes options in my ZOHO books account not available,I tried to find how to enable or check the way to use this option but unfortunately couldn't find it anywhere ,I'm in UAE ,kindly let me know what to do to solve this issue
    • Default Tagging on API-generated Transactions

      If one assigns tags to an Item or Customer, those tags get auto-populated in each line item of an Invoice or Sales Order when one creates those documents. However, if one creates the Sales Order or Invoice via the API (either directly coding or using
    • Direct Feed (Bank)

      Is Direct feed integration for AlRajhi and ADCB bank supported by Zoho Books in GCC/Saudi
    • Sales Order, Invoice and Payment numbers

      Hi zoho friends, it is me again, the slow learner. I'm wondering if there is a way to have it so the Sales order, invoice and payment numbers are all the same? It would be easier for me if they were the same number so there is not so many reference numbers
    • MS Teams for daily call operations

      Hello all, Our most anticipated and crucial update is finally here! Organizations using Microsoft Teams phone system can now integrate it effectively with Zoho CRM for tasks like dialling numbers and logging calls. We are enhancing our MS Teams functionality
    • New in CRM: Dynamic filters for lookup fields

      Last modified on Oct 28, 2024: This feature was initially available only through Early Access upon request. It is now available to all users across all data centers, except for the IN DC. Users in the IN DC can temporarily request access using this form
    • Customer Satisfaction (CSAT) Report

      From data to decisions: A deep dive into ticketing system reports The customer satisfaction (CSAT) report helps teams understand how customers feel about their support experience, identify service gaps, and continuously improve the help desk. It turns
    • Timeline Tracking Support for records updates via module import and bulk write api

      Note: This update is currently available in Early Access and will soon be rolled out across all data centers (DCs) and for all editions of Zoho CRM. The update will be available to all users within your organization, regardless of their profiles or roles.
    • Shifts in Zoho People vs Zoho Shifts?

      Hello Zoho People Team, We hope you are doing well. We are evaluating the Shifts functionality within Zoho People and comparing it to the standalone Zoho Shifts product. We’ve encountered comments and discussions suggesting that the Shifts feature inside
    • Disable fields in During action in Blueprint?

      Hi there. I've tried field disable (setReadOnly(true)) using client script and the event is onMandatoryFormLoad on detail page, assuming it'll work on blueprint fields, but it bears no result. Is this the expected behaviour? That we can't do this yet?
    • From Zoho CRM to Paper : Design & Print Data Directly using Canvas Print View

      Hello Everyone, We are excited to announce a new addition to your Canvas in Zoho CRM - Print View. Canvas print view helps you transform your custom CRM layouts into print-ready documents, so you can bring your digital data to the physical world with
    • FSM - Timesheet entires for Internal Work

      Hi FSM Team, Several of my clients have asked how they can manage internal timesheets within Zoho FSM. Since their technicians already spend most of their day working in FSM, it would be ideal if they could log all working hours directly in the FSM app.
    • Develop and publish a Zoho Recruit extension on the marketplace

      Hi, I'd like to develop a new extension for Zoho Recruit. I've started to use Zoho Developers creating a Zoho CRM extension. But when I try to create a new extension here https://sigma.zoho.com/workspace/testtesttestest/apps/new I d'ont see the option of Zoho Recruit (only CRM, Desk, Projects...). I do see extensions for Zoho Recruit in the marketplace. How would I go about to create one if the option is not available in sigma ? Cheers, Rémi.
    • Best Email Backup Wizard in 2026

      While searching for an email backup solution, my main hesitation was reliability. As a user, I had already seen many tools that looked promising but failed when handling large mailboxes, skipped folders, or caused authentication issues during the backup
    • CRM gets location smart with the all new Map View: visualize records, locate records within any radius, and more

      Hello all, We've introduced a new way to work with location data in Zoho CRM: the Map View. Instead of scrolling through endless lists, your records now appear as pins on a map. Built on top of the all-new address field and powered by Mappls (MapMyIndia),
    • Subforms and automation

      If a user updates a field how do we create an automation etc. We have a field for returned parts and i want to get an email when that field is ticked. How please as Zoho tells me no automation on subforms. The Reason- Why having waited for ever for FSM
    • Allow Managers to Create Shifts for Their Departments in Zoho People

      Hello Zoho People Product Team, Greetings and hope you are doing well. This feature request is related to Zoho People - please don't move it to zoho one! We would like to submit a feature request regarding shift management permissions in Zoho People.
    • Zoho Learn and Zoho CRM integration

      I would like to see an integration between Zoho Learn and Zoho CRM. 1. To be able to add articles in a related list in all modules 2. Zia to suggest related articles in a Deal or Case or Lead 3. Ability to read / search articles during a call / follow
    • Maintain steady traffic to your domain: How Domain Aliasing helps

      Consider this scenario: An organization has its primary domain as administrator.com. Now it wants to shorten its domain to admin.com because it's simpler and easier to remember. However, changing the domain completely can cause the following problems:
    • Why Sharing Rules do Not support relative date comparison???

      I am creating a Sharing Rule and simply want to share where "Last Day of Coverage" (Date field) is Greater than TODAY (Starting Tomorrow). However, sharing rules don't have the option to compare a date field to a relative date (like today), only to Static
    • How do I migrate OLM file to Gmail?

      Migrating emails from Outlook for Mac to Gmail can be challenging because Gmail does not support OLM files directly. This limitation often causes confusion and delays, especially when users need quick access to important emails and mailbox data on a web-based
    • CRM x WorkDrive: File storage for new CRM signups is now powered by WorkDrive

      Availability Editions: All DCs: All Release plan: Released for new signups in all DCs. It will be enabled for existing users in a phased manner in the upcoming months. Help documentation: Documents in Zoho CRM Manage folders in Documents tab Manage files
    • Workflow rule only allows 10 workflow per module

      Apparently a Zoho professional edition only allows 10 workflow rules per module. This makes workflow allocation literally impossible while allocating potential to different members of the team. I have 15 licenses. Is there a way in which related alerts can be varied? In other words, is it possible to have different related alerts be triggered with different rule criteria. so if I say, if potential is 'x' then trigger related alert 'x' and if potential is 'y' then trigger related alert 'y' Thanks,
    • IF Statement in Zoho CRM Formula Field

      Hi, I am attempting to write a formula field that will give me one result if one statement AND another statement are true, then a different value if the first statement AND a different statement are true, else 0. Stated differently: if account = destination
    • CRM Percent custom fields: When will it show the % symbol and behave like %?

      1. Actually Percent custom fields fail to show the % symbol. 2. When in formulas Percent fields work like number: 100 x 5% = 5 ideal world 100 x 5% = 500 what happens actually 3. When importing Percent fields the % symbol has to be removed and the data
    • Free Webinar: Zoho Sign for Zoho Projects: Automate tasks and approvals with e-signatures

      Hi there! Handling multiple projects at once? Zoho Projects is your solution for automated and streamlined project management, and with the Zoho Sign extension, you can sign, send, and manage digital paperwork directly from your project workspace. Join
    • Zoho Sheet - Desktop App or Offline

      Since Zoho Docs is now available as a desktop app and offline, when is a realistic ETA for Sheet to have the same functionality?I am surprised this was not laucned at the same time as Docs.
    • Automatically CC an address using Zoho CRM Email Templates

      Hi all - have searched but can't see a definitive answer. We have built multiple email templates in CRM. Every time we send this we want it to CC a particular address (the same address for every email sent) so that it populates the reply back into our
    • Editing the Ticket Properties column

      This is going to sound like a dumb question, but I cannot figure out how to configure/edit the sections (and their fields) in this column: For example, we have a custom "Resolution" field, which parked itself in the "Ticket Information" section of this
    • Zoho Bookings and Survey Integration through Flow

      I am trying to set up flows where once an appointment is marked as completed in Zoho Bookings, the applicable survey form would be sent to the customer. Problem is, I cannot customise flows wherein if Consultation A is completed, Survey Form A would be
    • "Total Hours" on Employee Attendance Report

      I'm learning that in Zoho jargon, "total hours" does not include paid breaks. Or at least not the way that my setup is working. That seems a little weird to me, since most jurisdictions in the US don't differentiate between time spent on paid break and
    • Call description in notes

      When completing a call, we type in the result of the call in the description. However, that does not show up under the notes history on the contact. We want to be able to see all the calls that have taken place for a contact wihtout having to go into
    • Bulk upload image option in Zoho Commerce

      I dont know if I am not looking into it properly but is there no option to bulk upload images along with the products? Like after you upload the products, I will have to upload images one by one again? Can someone help me out here? And what should I enter
    • Integration with...

      Dear Zoho Commerce team, Please could you consider the integration within Zoho Commerce / Inventory and Qapla'? (https://www.qapla.it/en/) This app is better than Aftership in many ways: - Aftership integration require PRO plan and price start from more
    • Next Page