Ah - apologies, I did overlook.
Okay, so firstly check the IP(v4) address of your web server against https://hetrixtools.com/blacklist-monitor/ and ensure there are no listings. Second, check your domain against Google safe browsing and McAfee lists - these are the most likely ones if your IP is clean.
If your IP is listed, speak to Siteground. If your domain is listed, run malware checks against your site, and then seek expert help to find the vuln and secure it.
Uptime Doctor still has a free plan:
Might be of interest to /u/Gequinn and /u/wfoojjaec as well.
And from below another alternative: HetrixTools
It is server monitoring by HetrixTools.com. Does website monitoring as well as instance monitoring and blacklisting too! Highly recommend (not self hosted but it's one of those really solid platforms).
I totally feel your pain.
I have a wired Rak at my house and lately it would on average do about 1.3 HNT/day and then out of nowhere it dropped to 0.2 HNT/day around 2 weeks ago and just started waking up earlier this week.
I blame it on the network lately. Prior to the 2021.8.24.4 firmware, all my hotspots were ripping.
If you want to monitor the uptime remotely, I use this (free):https://hetrixtools.comYou can setup an uptime monitor on port 44158 TCP to the public IP (keep in mind some ISP's change the public IP from time to time)... it'll ping every minute and alert if its down.
It helped me identify the hotspots on WiFi that were having issues. The wired ones never went down, outside of firmware updates.
Annoyingly DO does get used by spammers and so DO IP ranges do occasionally end up on the more strict blocklists.
That of itself isn't usually fatal. But, an IP with no reputation for sending "ham" is going to have a hard time delivering mail to the likes of Gmail and Outlook.com. You'll need to sign up for their respective postmaster tools, and make sure you're following all their published deliverability rules.
You'll also want to look into a blacklist monitoring service. HetrixTools is decent and free for small/personal use.
I just signed up withHetrixTools. Stupid cheap and includes a customizable status page. The windows agent is technically in beta but it does work reliably.
I’ve also use cloudradar.io for my homelab, but will probably switch to hetrix for cost.
I've been running game servers for a few years now, here's my advice.
Administration: If you're fine with the terminal, you can forgo Cockpit and just run updates when needed via SSH. Highly recommend installing unattended-upgrades for things like security patches, also look into CrowdSec (It's like Fail2Ban but community driven.)
Pterodactyl should be safe being exposed but there is always a chance of a vulnerability. If you feel like it's needed you can put something like Cloudflare access in front of it. Pterodactyl supports 2FA out of the box for logins, definitely enable that.
UptimeKuma is a great way to monitor your servers it can listen to a port so if a specific game server goes down you can see what one (also has a public dashboard). I used HetrixTools too for a while if you don't want to host the uptime monitor yourself.
Pterodactyl also supports S3 Backups for your game servers - I recommend taking either weekly or daily backups on the off chance something gets broken or you need to restore. Backblaze B2 storage is S3 compatible and very cheap.
My best guess is that your domain is blacklisted. Check Hetrix Tools (https://hetrixtools.com/) which will tell you if you/your domain and IP address is blacklisted or not.
As far as deliverability I just signed up for a new service and giving it a try. So far, I'm getting opens/clicks on a list I was curating for OPENERS as well as Unsubscribers (means they are opening!) and then flat out accounts that should have never made it that far. I did get a few spam complaints, but that's email marketing.
Your issues seem like ones I ran into back in June of this past year. I basically was using solo ads to build and then if you know how that usually works, you will get a few buyers, but usually not enough to offset or come out ahead on the commission side of things.
I would check to see if your IP address and/or domain are blacklisted. If they are, you might have to re-think all of this.
I use this: https://hetrixtools.com
You can monitor up to 15 devices for free and create a basic status page.
Setup a ping monitor on port 44158 TCP (assuming you have port forward enabled at the location).
E-mailed alerts are pretty responsive.
I've tried a few online tools: Freshping, UptimeRobot but finally went with Hetrixtools. Awesome support and free up to 15 monitors. Really happy with the service! If you plan to sign up with them you can (but absolutely don't have to) use my affiliate link
If you do you will get 3 extra monitors, total of 18 instead of 15.
https://hetrixtools.com/dashboard/
I fully recommend Hetrix based on the features available on their free plan.
Historic CPU/RAM/Disk I/O is available as well as the obvious monitoring alerts.
If I may recommend HetrixTools:
https://hetrixtools.com/uptime-monitor/
Disclamer: I work for this company so I can't possibly be 100% unbiased, but I think that we've got a good price per quality ratio.
I suppose it's too late for the OP to use the recipe, but I think Heroku's free tier might work.
Things to consider:
1) As a free dyno gets idle on inactivity, you will need to set up a monitoring system (for example, I used free https://hetrixtools.com/ on a couple of projects) to make requests and keep dyno awake.
2) The filesystem is limited to 512 MB, so if your site is big, it might be not for you. Or you can offload everything to S3.
PS: Overall, the hosting is typically cheap comparing to the cost of labor. So I am surprised that TYPO3 developers have such issues.
Thanks for explaining. Longer term you might want to think about your network layout and whether having multiple routers is optimal. For now, maybe have a look at an agent-based monitoring solution like Syspectr or Hetrix Tools?
I recently asked this exact question (literally uptime robot and whether or not people were getting false positives -- though in my case the alerts are actually valid as far as I can tell) and someone here recommended HetrixTools, which I really have been liking. https://hetrixtools.com/
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the free tier works well for what I was wanting, you have to log in at least once a month though w/ it to keep it
The free blacklist monitoring function of MxToolBox is limited to a single IP, and the paid service is extremely expensive. I've migrated to https://hetrixtools.com/ years ago and haven't looked back. You can monitor up to 32 IPs for free - their only requirement is that you have to login once a month, and you can remove this requirement for 5$/year. The paid plans are much more fairly priced than the ones from MxToolBox.
I'm loving Hetrix Tools at the moment, really impressed over the last few months:
https://hetrixtools.com/pricing/uptime-monitor/
You have to login every 30 days on the free plan, which isn't a terrible fest, and they send you email reminders.
Thanks for the suggestions and comments. For those interested or I ended up going with this service;
https://hetrixtools.com/uptime-monitor/950002.html
Their free tier does everything I need and allows me monitor system and services as required through a combination of site monitoring, service monitoring and on-server monitoring app. Makes nice reports and offers an API that I can utilise to build into my software as well.
(that's an affiliate link, by the way)
Found it via a promoted reddit post so I guess somethings working as intended!