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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Uptimerobot’ Category

Great tool: the Toptal Colorblind Web Page Filter

Posted by jpluimers on 2020/08/06

Colorblind Web Page Filter

Colorblind Web Page Filter

A great tool I found out about a while ago [] Toptal Color Blind Filter.

It shows the original web page and the rendering for various types of color blindness:

  • protan -> Protanopia: red/green color blindness; anomalous red cones
  • deutan -> Deutanopia: red/green color blindness; anomalous green cones
  • tritan -> Tritanopia: blue/yellow color blindness; anomalous blue cones
  • grey -> Greyscale/achromatopsia: quick check for all forms of colorblindness

Because of a comment at[WayBack] Forums… – JWP – Google+, I used Toptal to notify Uptime robot that their status pages are hard for color blind people: [WayBackJeroen Pluimers on Twitter: “Some color blind people indicated to me that @uptimerobot status pages are hard for them to read. Examples are for @EmbarcaderoTech as they have subdomains being offline often: …”, so lets look at how people with various types of color blindness see :

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Posted in *nix, Development, Monitoring, Power User, Software Development, Uptimerobot, Usability, User Experience (ux) | Leave a Comment »

Duh moment: when is querying your DNS infrastructure and it appears to be uptimerobot

Posted by jpluimers on 2020/07/28

From the hindsight department [WayBack] Nice when someone in Dallas using is querying your DNS infrastructure for many permutations of domains…… – Jeroen Wiert Pluimers – Google+.

Wolfgang Rupprecht gave me some hints on the cause, as the IP address Google Search used to be of a gaming server: [WayBack] TwotailsTikat’s Profile – Member List – Minecraft Forum

After a good night sleep,

# nslookup name =

In retrospect: perfectly normal behaviour for monitoring machine “snip”.

Log by


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Posted in *nix, DNS, Internet, Monitoring, Power User, Uptimerobot | Leave a Comment »

Do I really need to write a WordPress API wrapper to check the status of “missed schedule” posts?

Posted by jpluimers on 2020/01/29

After years with “missed schedule” posts on (paid!) based sites, WordPress has documented that the scheduler officially does not support more than 100 posts:

[WayBackWarning: Please do not schedule more than 100 posts. Any posts scheduled beyond that amount will not be published.

In practice this is not fully true, so lets explain that a little.


Imagine the list of scheduled posts as a list of posts to be posted anywhere from the near future (lets call that tail) until far in the future (for now head).

As long as you schedule posts in head to tail order, then there is no problem. You can schedule 100s of posts (usually I’ve between 700 and 1200 posts scheduled that way).

The problems appear when:

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Posted in *nix, Development, Missed Schedule, Monitoring, Power User, SocialMedia, Software Development, Uptimerobot, Web Development, WordPress, WordPress | Leave a Comment »

Uptime Robot on Twitter: “Sorry all that the API and status pages fluctuated since the last 18 hours. The issue is completely fixed and it is all back to normal now.”

Posted by jpluimers on 2018/12/04

[WayBackUptime Robot on Twitter: “Sorry all that the API and status pages fluctuated since the last 18 hours. The issue is completely fixed and it is all back to normal now.”

[WayBackJeroen Pluimerson Twitter: “Some are still broken, especially the ones with IDs 778601760 778601763 778601765 778601777 778601814 779973649 779677530 779677532 All of them reachable through various ISPs, but UpTimeRobot marks them down since about 11 hours”



Edit 20181205

Found out what happened: the IP got blocked on some spam lists. This is odd:

Even though the SMTP server behind it has relay blocked apart from the 2 domains it is primary MX for, somebody found a trick around it, I think by sending mail to the primary domains that

  1. are not caught yet by the installed backlist filters
  2. later bounce when forwarded to their forward address because their blacklist filters are by now more up-to-date,
  3. then the bounce email being flagged as SPAM.


The trick caused the IP to appear on 3 blacklists according to MXTOOLBOX:

Blacklist Reason TTL ResponseTime
 LISTED CBL was listed  Detail 806 0 Ignore
 LISTED Hostkarma Black was listed  Detail 805 0 Ignore
 LISTED Spamhaus ZEN was listed  Detail 300 281 Ignore

Checking these revealed all to be around CBL:


This IP address was detected and listed 6 times in the past 28 days, and 0 times in the past 24 hours. The most recent detection was at Tue Dec 4 02:25:00 2018 UTC +/- 5 minutes

Hostkarma Black:

Your reverse DNS is correct! –
The IP address for the reverse lookup name matches the original IP – RDNS Information

This is a list from our log files showing the activity from IP address Our system stores information for 4 days.

/ip-log/karma.log.06:black auth-bad ID=79648-15207 X=mxbackup []:40353 HELO=[[]] SN=[] AUTH=[antonio] T=[] S=[Re: RcPT[(ALERT) | 0644664458]]

Spamhaus ZEN: is not listed in the SBL is not listed in the PBL is listed in the XBL, because it appears in:

Further research also found an entry in

Check result of IP

This is the rDNS found:

This IP was flagged due to misconfiguration of the e-mail service or the suspicion that there is no MTA at it.

For the delist key can be sent, select the e-mail address responsible for this IP:

  • add a PayPal user’s email for 6.00 BRL.
  • add a PayPal user’s email for 1.50 USD.
  • <> qualified.
  • <> qualified.
  • <> qualified.

The rDNS must be registered under your own domain. We do not accept rDNS with third-party domains.

A chicken-and-egg situation here: since is blocked because of the blacklist entry, I cannot request a validation email for the blacklist entry.

But then there was MultiRBL showing that most DNS black lists are aggregators of others.


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Posted in *nix, Monitoring, Power User, Uptimerobot | Leave a Comment »

UptimeRobot is written in PHP and runs on IIS

Posted by jpluimers on 2018/11/28

In [WayBackJeroen Pluimers‏ @jpluimers: Every now and then editing @uptimerobot entries failed. Just “HTTP Error 503.4 – Service Unavailable The FastCGI pool queue is full” 1/2 I found out that UptimeRobot:

There is also a maintenance page at [] and []. If you get to those, then retry in ~10 minutes as sometimes it takes that long for an update to be processed.

Sometimes setting up multiple Android devices for the same uptimerobot account can be a bit of a hassle: [WayBack] Uptime Robot on Twitter: “Once logged in to the account from another Andriod device, that device will be added as an alert contact too.… “.

All in all it is still a nice tool (:


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Posted in *nix, Development, IIS, Monitoring, PHP, Power User, Scripting, Software Development, Uptimerobot, Web Development | Leave a Comment »

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