The stability is good. 

There have only been a couple of occasions where we've had high RAM usage of the Kerio, where it may be a more complex network. What we found is that over the course of a week or 10 days, the RAM utilization would slowly increase to a point where it would be 100 percent usage and then you couldn't do anything with the box. You would have to physically power it off. 

We do have cases open for Kerio with GFI and they're looking into it. Apparently there is going to be quite a big software update coming soon, which will change the backend workings. That's hopefully going to make a big difference, but the problem has only happened in one or two cases. Other than that, it's generally pretty solid.

The product works well. We seldom have issues with the product, hardware-wise or software-wise, and we have firewalls that have been running for more than a year without even a reboot. The only reboot they get is when they need an update.

When they went from Kerio directly to GFI, GFI implemented some new software solutions in it and did some things their own way, which helped to make the product a bit safer than it already was. These were improvements that were really needed and we wanted as much as we possibly could get, and therefore are much appreciated.

The NG100, which is the lightweight firewall — and it can do pretty much the same as the large NG500 — has an external adapter and that has broken at least three or four times, and that's a problem. Even for those little firewalls, an adaptor should not break. It's probably because of heat dissipation or the like. We don't have this problem with the NG300, which also has an external adapter, but it's a bit different and a bigger adapter. The NG500 doesn't have that problem at all. It has an internal power supply and there's nothing wrong with it. We have never had one fail, so far.

The solution is stable and reliable. There are no bugs or glitches.

However, we changed something, and we've had some problems with performance. We are in the process of debugging the issue. For the most part, it is reliable. 

We have not had any problems with the stability at all. It's pretty solid once we get them running. Besides reboots for updates, we usually never have to do anything with them. The only ones that I can ever remember failing are caused by physical hardware failures. A lot of times either there is a lightning strike, electrical surge, or something like that. Once or twice, we've had a fail where we can't tell exactly why it failed, but it's always been the hardware that's failed, not the firewall software. I do remember one very old box that had gone through multiple iterations and had copied backups from hardware to hardware to hardware for almost a decade, which started acting a little funny. It stayed up, but we would see weird logs that didn't make sense. For that one, we finally did a backup, wiped it, restored the backup, and all the problems went away. That's the only time where the software was the cause and it was nothing that actually affected end users.

I would give KerioControl a nine out of ten rating for stability.

The stability has been very good. I can only think of one or two occasions where we've had an issue and a restart of the firewall seems to bring it up again. I don't think I've ever had a major issue with it at all.

The high availability and failover protection haven't been that critical for us. The stability of it has been so good that we haven't needed to look at it. Because of the use case, an outage doesn't affect us as much as if it was a production network. And TechPath would be on standby with other hardware if we needed or with assistance. So we never really looked at the high availability stuff.

The stability has actually improved quite a bit. There were some bugs found in previous versions up until about last spring, and then they concentrated on fixing some of the issues causing us some problems. As of the last update, it's very stable.

It is a very stable product, which over the years has been very good. 

I rate the product’s stability a seven out of ten.

The stability is pretty good. It ticks along nicely. I occasionally have to reboot it. It starts throwing strange errors on different clients. There was a period where Kerio was releasing software updates at least once a month, which would force the reboot, but I think kept it pretty tidy. Over the last year, their updates haven't been very regular. When it gets to running for about 60 days or so, it does get a little funny and the reboot sorts it out. I don't know what's going on there and why their updates have slowed down.

A good thing with the Antivirus module is there are probably six or seven dozen updates every 24 hours to the antivirus signatures. Therefore, they do a pretty good job of keeping at the head of the game.

I found it to be fairly stable. Their updates have gone very smoothly, which is a nice thing. It doesn't crash during updates. I've had very good luck with that. Whereas I can't say the same thing with both Cisco and FortiGate.

The tool's stability is great. 

The stability has been fine. We have no concerns or complaints.

I don't remember any glitches. I haven't had problems with it for a very long time. But I use it very specifically for a certain purpose and that works fine.

The stability is pretty good. I've only had one issue with it before. It was set to update on its own, and it didn't update and the update failed, so it didn't come back on for some reason.

If an update fails, it should have some kind of automatic rollback to bring itself back on. Because when it does that at night and it stops, I don't really get a notification that it's stopped. It's not on anymore so I don't find out that nothing has worked all evening until the next morning.

Kerio Control can be used with three internet connection modes:

• Single internet connection
• Fail-Over
• Load-Balancig.

If you put the appliance in Fail-Over mode it will simply FAIL, and will bypass your routing rules. It will start balancing connections (even when you have not configure it) and the stability will be annoyingly poor. However, the user manual says that you have to put it on Load-Balancing mode if you want to use routing policies which is contradictory, but that's how it works. When you put the appliance in Load-Balancing mode it i will work great.

The solution is very stable. Organizations won't have to worry about the solution crashing. I consider it to be very reliable. We have only had one firewall go down in the five years we've been using it, and I can't recall any other problems.

That said, when it comes to major updates, they need to do a lot more testing before they release things. Last year there had been a lot of bugs in major releases. It may have been because of the takeover. GFI has since taken over the brand.

Other than the quality of the NG100, stability has been extremely good.

The only stability issue that we have is with regard to the latency and using MyKerio. A potential deficiency I've encountered has had to do with the actual physical ethernet ports on the device. They seem to be very susceptive to shock. We have had to replace a few units due to that. Especially if there are devices that are POE devices. Part of it has a POE that goes out to the antenna and then there's an ethernet connection that goes back to the Kerio. We've noticed that for whatever reason, that particular device or combination don't play well together.

Its performance is average, and it isn't that stable. I would give it a 50 out of 100. 

Kerio Control stability is extremely stable. On the administration side, you have total control because of MyKerio. Which is a portal that allows you to control all your Kerio Controls and other Kerio solutions. Similar to other firewall vendors nowadays, they have their own portal to centralize the management of your firewalls. 

If I came across a client that was a small to medium enterprise, I'd probably recommend it, but a lot of them have a solution in place now anyway. It's hard to get those opportunities for new business in that regard, but I reckon it would probably scale quite well. I'm at 25 licenses, but that's only because we have so many devices in this house. It looks like it probably would scale. As I said, with that level of reliability, that probably would be an issue if you wanted to scale 100 to 200 licenses.

We did try the proxy feature, but once again, that failed miserably. It ran well for a few weeks and then it died on us, and it was really quite hard to diagnose what had gone wrong. We turned it off and went back to a previous configuration which was a bit disappointing. It comes back to that reliability, whatever it is that makes it conk out is clearly a problem.

It's pretty stable. I don't have too many complaints about the product.

It's a real good product. This version has many features for creating VLANs and also for traffic rules, firewall rules, etc.

The stability is very good. I don't think it's ever failed. 

We had one time where there was an update, a couple of years ago, and it changed a setting for the failover and load balancing. As a result, we almost needed to roll back to a different version. We ended up finding the right setting. But that was the only thing that's happened really. Apart from that, they update fine.

It's extremely stable and the uptime is incredible in terms of how it stays connected, and we have had no issues in over two years of using it.

KerioControl is stable because it is a Lunux-based system. However, it depends on the cores because they do not change the base core of Linux systems.

The stability is really good. I haven't had any issues whatsoever. 

Stability is good. We are satisfied with the performance of the system.

I did not face any issues with stability while using the tool's trial version. 

The solution is stable.

Kerio Control's stability isn't good.

The stability is good.

The VPN features are awesome. The only issue that we had is when they changed versions. They removed a security feature and blocked out all the old VPN connections. As a service provider, we had to do an update for a lot of clients' VPNs after their update came out, which created more work for us.

This solution works. The only issues are hardware failures.

It's pretty stable. We had some problems with Kerio Control virtual appliances. If it was running more than 20 days, it would become really slow and sometimes it would just stop working. When we rebooted the solution it would come back up. But that was something that was happening a year-and-a-half ago. Since then, we haven't had any more problems with it. 

We had a few solutions that just went corrupt. We're not sure if that was the disk or Kerio itself. We always have an installation of the virtual appliance on the server, so we can set up a new one, load the backup back in, and be up and running again in 15 minutes.

The solution is stable. However, we have had some problems, and we want to receive some updates for the IPS module. Sometimes we have errors downloading the IPS updates.

It's stable and we rarely have any reliability issues.

Kerio Control is very stable.

It's very stable, and updates are frequent.

The stability is fine. 

I have not had any problems with the stability of the solution, It is very stable. My clients are mainly small size companies. 

It has been a stable product. We haven't had any issues apart from yesterday when it somehow froze. It was the first time we experienced such an issue. 

Yes, in version 9.2.5, but we solved it quickly.

The stability of Kerio Control is good.

It is a stable solution and we have not had any major stability issues in our four years of using it. 

It is pretty stable. We don't have any issues.

This solution has been pretty stable overall. That said, there is room for improvement.

For some clients, some of the options cause problems. Filtering, for example, is something that one client does not need at all. Turning this off seems to straighten things out.

I have been awoken at 3 am by emails telling me that things are down, and that has happened within the past couple of updates, but not as much. I keep my eyes on the Kerio forums and watch for other people who say that it is time to upgrade again.

It's very stable. 

I have not had stability problems.