Forum Discussion
NimbostratusMontoring https port in windows server 2012 is not working with F5
Hi,
We have server listening on port 443 behind F5, The pool members is unable to monitor the server on port 443.
Kindly advice
Regards, Midhun p.K
26 Replies
Michael_JenkinsCirrostratus
There's SOL12531 that talks about monitors a little bit, and then this article that adds a little extra information.
Whenever I'm having monitor issues, I try a couple different things.
I try to do a1:
from the F5 CLI to verify that the url I'm trying to monitor is working properly and the response is coming back as expected.curl
Turn on monitor debugging for the member and check the log that gets created. Those steps are as follows:2:- Open the pool that is having the problem (let's call it MY_POOL)
- Make sure the monitor is active on the pool (let's call it MY_MONITOR)
- On the
tab in the pool settings, click on one of the members (let's call it 10.0.0.1:3389)Members -
Enable the checkbox for
Monitor Logging- Open an SSH session (I use Putty to connect) to the device and log in to the shell.
- Run the command
cd /var/log/monitors - Run the command
ls -l - Look for the file referencing your pool and member (most likely in our example it'd be something like
)_Common_MY_MONITOR__Common_10.0.0.1_3389.log - Run the command
(where FILENAME is the log filename)tail -f FILENAME - It may be visible immediately, but you should see where the monitor sends the request to the server (and you'll see the
string), and you're looking for thesend
string that comes back.recv - Take that
string and update the monitor and see if the pool member(s) show up green again.recv
- Go back in and disable the monitor logging for that member so you don't have excessive logging filling up space.
Hopefully, this will help figure it out. If your log file ever looks like it's not updating, delete the lo file and remove the monitor from the pool and re-add it. I've found that will kick it back off again.
Hope this helps.
StephanMantheyNacreous
Hi midhun,
in addition to Michael´s detailed answer I would also consider the server expects a request via TLS with SNI (server name indication). There is an article with description of an external monitor using openssl s_client here on DevCentral. You can validate it from CLI by using the following syntax:openssl s_client -connect : -servername -quietNow openssl establishes a connection using TLS with SNI attribute and you can paste in a valid request followed by two Carriage Return / New Lines (aka Enter):
GET / HTTP/1.1 Host: Connection: closeI had to use the described solution in a customer´s SharePoint environment and just added the ability to work in route domains. It works great on v11.5.1 since a couple of months.
Thanks, Stephan
InnOOne small note : I believe there is no monitor logging checkbox on http/https monitors. You may rely on your back-end web server logs to get logging...
- Michael_JenkinsThe monitor logging checkbox is found when you go to the Pool >> Members >> Click on a specific member. I'm on 11.5 and the option is there for both http and http monitors. But I agree too. Backend logging may be helpful as well.
- InnOWow. Interesting ! Never noticed that check box in there :) Thanks.
F5Maniac_72324One small note : I believe there is no monitor logging checkbox on http/https monitors. You may rely on your back-end web server logs to get logging...
- Michael_JenkinsThe monitor logging checkbox is found when you go to the Pool >> Members >> Click on a specific member. I'm on 11.5 and the option is there for both http and http monitors. But I agree too. Backend logging may be helpful as well.
- F5Maniac_72324Wow. Interesting ! Never noticed that check box in there :) Thanks.
- InnO
On your Windows 2012 server, I assume you are using IIS web server. By default, authentication is set to anonymous, so monitors should work out of the box. Check the authentication setting on your web server, if it is set to something else than anonymous, you may have to adjust your monitors.
- midhun_108442
Hi Michael/Stephan,
Thanks for ur input, But am running version 10.2 and unable to run the above commands.
No monitor Logging option and monitor directory(/var/log/monitor) exist in 10.2 version
For Openssl no option to use -Servername.
Regards, Midhun P.K
- StephanMantheyHi midhun, sorry, my unit was already updated to openssl 1.0.1j. Here is what you can try with cURL: curl -k -H "Host: " https:/// Thanks, Stephan
- StephanMantheyHi midhun, did the **curl** syntax example above work? If it does not, you probably need to update your TMOS version Thanks, Stephan
- Michael_Jenkins
From SOL12531, there's a spot that talks about using curl to test your URL. Are you able to do that on 10.2 from the command line (SSH into the box)?
Also, what's your config look like regarding send and recv strings?
- midhun_108442
Hi,
I found the issue now, it is related to certificate, When we disable the server certificate f5 can able to monitor https port. monitor is showing down when we configure certificate on the server. Certificate we are using in server issued by CA.
Regards, Midhun P.K
- midhun_108442
HI,
Our Server is using sha256 certificate issued by CA , But F5 is unable to monitor the pool when we bind any Sha256 certificate on the server, Kindly advice.
Regards, Midhun P.K
- midhun_108442
Hi,
Can anyone help me to solve this certificate issue, F5 unable to monitor the server when it use sha256 certificate.
Regards, Midhun P.K
- boneyard
MVP
you are asking this question on several places, please make one clear question, trying to get attention like this will probably not work.
