Dns ssl problem

I have a very complicated problem with thunderbird.

The ssl connection to my provider is very slow, like almost 3 minutes slow!
After the almost 3 minutes the connection works.

i tested the connection with openssl like this
openssl s_time -connect imap.soverin.net:993 Result: 1 connections in 267 real seconds

then i tested the connection like this
openssl s_client -crlf -connect imap.soverin.net:993 Result: fine, after a waiting time of almost 3 minutes!

Next test is using ip address instead of domain name
openssl s_client -crlf -connect 185.233.34.144:993 Result: this works instantly, perfect.

but if i do the same on another computer in the same home network there is no delay, it works instantly with all tests.

I i start my computer with a live usb then the same commands that causes delays on my normal install work instantly on the live version. No problems on the live boot.

So my conclusion is that somehow the execution is delayed by almost 3 minutes, the big question is where/how?

my install and thunderbird worked fine for years, no firewall installed, standard xfce desktop. all other connections work fine, firefox works fine.
I tried with a new thunderbird profile, same problem.

if anyone has any ideas please do as i’m out of ideas myself

If this is the only host you have this issue with, a super easy fix is to edit your /etc/hosts file and manually add that host entry.

If it impacts more than that, you’d need to investigate how DNS is setup on your PC and network.

thanks for your reply but i’m afraid it isn’t that simple.

my problem has nothing to do with dns settings in router or isp, it is something specific on my pc that causes a delay.

If i add the mail provider ip address instead of imap.soverin.net in thunderbird it won’t work either.
All other internet related things work perfectly, only thunderbird has a problem.

The thunderbird install on my other pc (which uses the same network and same dns) it works perfectly

Well strange enough i tried the same commands this morning on my pc and now it works…
I don’t understand what happened.

Strangely my account settings are wrong in Thunderbird (starttls versus ssl) while i can’t recall i did change that…
The weird part is that the ports i set for smtp and imap are not working anymore (my provider uses 2 ports for each) but the alternative ports do…

very strange but it is working now so closing this one

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