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Vendor Remote Access for Manufacturers:
Who Can Connect to Your Systems?
Quick question for the plant manager: how many outside companies can log in to your equipment right now? The machine builder. The software vendor. The controls integrator from that project two years ago.
If the honest answer is “I’d have to check,” you are in good company. Most plants are in the same spot.
The short answer: To keep vendor remote access useful and accountable, write down who has it, why they need it, who approved it, and when it ends. Remote access means an outside company can log in to your computers or equipment over the internet without coming on site. It is valuable when a line goes down. It becomes a problem when nobody can say who still has it.
Not sure how many vendors can log in? Start with step 1 below.
What Unmanaged Vendor Access Can Cost a Plant
Think of vendor access like keys to your building. Nobody minds that the keys exist. The problem is when nobody remembers who has one.
When access is not tracked, a few things tend to happen. A setting changes on a machine and nobody knows who changed it, so the line sits while people track it down. A vendor connects to the wrong system at the wrong time and causes unplanned downtime. Or a customer or insurer asks who can reach your production systems, and the business cannot give a quick, clear answer. None of this requires a cyberattack.
Illustrative scenario: Picture a mid-sized metal fabricator in the St. Louis region. Over the years, its machine builder, its ERP vendor, and two controls integrators each set up their own way to log in. A line stops on a Monday morning after a setting changes overnight. The maintenance manager spends the morning calling vendors to find out who connected. A shared list and a simple approval step would have answered that question with one look. (This is a made-up example to show how the problem plays out. It is not a Computerease client.)
Vendor Remote Access Checklist: Five Questions to Answer
1. Who can connect today?
Start with an inventory. List every outside company that can log in, which system they reach, and who inside your business owns that system. Include machine builders, software vendors, controls integrators, and anyone who worked on a past project.
Most plants find access they forgot about, often from a project that ended long ago. That is normal, and it is fixable.
2. What job does each vendor actually need to do?
For each vendor, write down the real support task. The machine builder may need to troubleshoot one controller. The software vendor may need to install updates on one server.
“Full access, all the time” is rarely what the job requires. Limiting a vendor to the system they support means a mistake or a stolen login affects one machine, not the whole plant.
3. Who says yes, and for how long?
Decide who approves each connection, how long it stays open, and who to call if something goes wrong. The vendor should ask first, and someone in your building should say yes.
That approval should come from someone who knows the line, such as the maintenance or plant manager, not just whoever answers the phone.
4. What should you write down?
Keep a simple log of each connection: which vendor, which system, when, why, and who approved it. It does not need to be complicated.
When a setting changes and production slows down, that log answers the question “who changed this?” in minutes instead of days.
Want help building yours? Book your Vendor Access Review.
5. What happens when the work is done?
When a project ends or a vendor relationship changes, review the access and turn off what is no longer needed. A quarterly review of the full list catches anything that slipped through.
What a Simple Vendor Access List Looks Like
Here are three sample rows. Each one records the vendor, the system, the business reason, the approver, the next review date, and the current status.
Example rows: These are made-up examples to show the format. Never store passwords in this list. Passwords belong in a secure password manager, not a spreadsheet.
| Vendor | System | Business Purpose | Approver | Review Date | Access Status |
|---|---|---|---|---|---|
| Machine builder | Line 2 controller | Troubleshooting during approved service calls | Maintenance manager | 2026 | Off until requested |
| ERP software vendor | ERP server | Support tickets and version upgrades | Controller | 2026 | Active, sign-in code required |
| Controls integrator (past project) | Engineering workstation | Project closed; no current need | Plant manager | 2026 | Turned off, pending removal |
Where Vendor Access Gets Hard
Steps 1 and 2 need operations and IT in the same room. Operations knows which vendors support which machines. IT knows how those vendors actually connect. Neither one has the full picture alone.
Steps 3 through 5 need someone to keep the process going every month without slowing down production support. That ongoing ownership is where outside help pays off.
One caution: before changing how vendors connect to production equipment, have operations and IT review the change together. A change made at the wrong time can stop a line, which is exactly what this process is meant to prevent.
Common Objections
“Our vendors need fast access when a line goes down.” Agreed. A good process makes emergency access faster, because the approval path is already clear.
“Our IT person handles this.” Great. This gives them a shared list operations can see too.
“We’ve never had a problem.” Good. A shared list keeps it that way when people or vendors change.
How Computerease Helps Manufacturers Manage Vendor Access
Our manufacturing IT support team already works directly with ERP, CAD, and production software vendors. That puts us in a good position to see who connects to what and why.
In a Vendor Access Review, we sit down with your operations and IT people and build the first version of your vendor access list together. We point out which access needs a closer look and help set up an approval and review routine your team can keep up with. Where it makes sense, our network security work can help limit each vendor to the systems they support.
Since 1984, our family-owned team has supported manufacturers across Missouri and Illinois, with local help from our Chicago and St. Louis teams.
Not sure who can log in to your plant right now? Book your Vendor Access Review. You will leave with a first version of your vendor access list and a short list of access to review.
Schedule Your Vendor Access Review
Start with a 15 minute call
Frequently Asked Questions
Keep a written list of every outside company that can log in, what system each one reaches, why they need it, who approved it, and when it will be reviewed. Give each vendor only the access their job requires, have someone inside the plant approve each connection, and close access when the work is done.
Someone inside your business who understands the system and the work being done, usually the person responsible for that line or system, such as a maintenance or plant manager. IT should set up and monitor the connection, but operations should decide whether the work should happen and when.
Review it on a regular schedule, such as every quarter, and any time a project ends, a vendor relationship changes, or someone who approved access leaves the company. Access that is no longer needed should be turned off, not just left unused.