We upgraded service desk server that uses apache tomcat to run. Tomcat version changed from 7.0.55 to 7.0.62 After upgrade 2 PRTG HTTP XML/REST Value sensors that monitor that server stopped working. They show "An unexpected error occurred on a send." instead of sensor value. Pade is returning some values in JSON forms, it did not change during upgrade. Same page that is used for sensors if perfectly forking in both ie and chrome. Other sensors, like HTTP Advanced and HTTP SSL Certificate Expiry are working ok too. Need help.

Article Comments

What PRTG version are you running?


Aug, 2015 - Permalink

PRTG Network Monitor 15.3.18.3616+


Aug, 2015 - Permalink

In sensor log there is just this: ... [Trace] Sending request [Error] The underlying connection was closed: An unexpected error occurred on a send. Exitcode custom_error


Aug, 2015 - Permalink

During experiments I figured out that setting senspors parametr "SSLv3 Connection" from default "Force usage of SSLv3" to "Use SSLv3 if available" enables sensor. Its a possible workaround, but what happens with such settings? PRTG uses TLS?


Aug, 2015 - Permalink

Ah, okay - yep, PRTG uses TLS then; 1.2, then 1.1, then 1.0 :)


Aug, 2015 - Permalink

I seems that in tomcat after 7.0.57 SSLv3 is disabled by default https://tomcat.apache.org/tomcat-7.0-doc/changelog.html

But still I have a question: I dont have the TLS option like on screenshot https://helpdesk.paessler.com/en/support/solutions/articles/76000065173-my-http-sensors-could-not-create-an-ssl-secure-channel-and-are-down-what-can-i-do Is TLS really working in my case?


Aug, 2015 - Permalink

The naming is different for various channels, i.e. sometimes not consistent :)


Aug, 2015 - Permalink