I can confirm this (debian jessie).

After a postgres update (and an involved stopping/starting of the database) we "randomly" lost calendar subscriptions. I was puzzled until I found this bug report, which perfectly explains what happened.

I think this bug should be marked as (very) important, because (configuration) data is lost.

we have something similar with Debian Jessie and Outlook 2013 with EAS
Subscriptions of calendar are lost.

The reason for connection lost was to many sql connections were opened so there was no more connection to database possible.

The only way to fix this was to create a new outlook Profile.

In Thunderbird we didn't noticed that until now.

We had an delete of subcribed calendars in SOGoWeb too.

Our Problem are too many database connections (see bug https://sogo.nu/bugs/view.php?id=4083) so we have the delete more then one time at a user..

I can confirm this problem too.

The connection to the database server was lost due to a database server restart. After this one or more calendar subscriptions were lost by all users who tried to access the web calendar in the outage time.

I can confirm this problem too.
Thunderbird with SOGo plugins disables calendars when DB is out of service.

For us this issue is wery important - 15k users are affected time to time...

Is this problem only observed with a PostgreSQL database?

We have the problem also and we have an mysql DB MySQL 5.5.54

I've tried to reproduce it with no luck on MySQL.

Same problem with postgres 9.3, is very important for us to.
i tried to up max connection on postgres, but same problem...

edit : upload error file

I need to have a reproducible way to duplicate the problem here.

We did extensive testing and never been able to trigger it.

At the moment we detect the loss of calendars with the command
tail -f sogo.log | grep PROPFIND | grep 404 | grep Calendar

And when calendar are lost :

Jun 22 07:38:18 sogod [6983]: 127.0.0.1 "PROPFIND /SOGo/dav/delxxx/Calendar/valxxx_3C8D-5790D500-D-6867F280/ HTTP/1.0" 404 87/394 0.010 - - 0
Jun 22 07:49:03 sogod [7003]: 127.0.0.1 "PROPFIND /SOGo/dav/delxxx/Calendar/valxxx_3C8D-5790D500-D-6867F280/ HTTP/1.0" 404 87/394 0.009 - - 0
Jun 22 08:04:11 sogod [7008]: 127.0.0.1 "PROPFIND /SOGo/dav/delxxx/Calendar/valxxx_3C8D-5790D500-D-6867F280/ HTTP/1.0" 404 87/394 0.009 - - 0
Jun 22 08:19:09 sogod [6989]: 127.0.0.1 "PROPFIND /SOGo/dav/delxxx/Calendar/valxxx_3C8D-5790D500-D-6867F280/ HTTP/1.0" 404 87/394 0.008 - - 0
Jun 22 09:55:18 sogod [6997]: 127.0.0.1 "PROPFIND /SOGo/dav/farxxx/Calendar/desxxx_personal/ HTTP/1

How can you help you see more clearly?

I will try to reinstall a full server with postgresql 9.6 instead of 9.3 ... no?

Hi,

we have the same problem here since the last version of SOGo v2 (2.3.21).
For us, we didn't have this issue with the 2.3.20 (i will confirm that because we are actually downgrading SOGo to 2.3.20).
We use postgreSQL 9.3 and we will try to upgrade to postgresql 9.6.

Also, we have the same logs that realynot when calendar are lost.

thanks for your help,

Well if a PROPFIND returns a 404, that means the resource is gone from SOGo's point of view. there must be a reason why we say so if in fact, it isn't.

This is just a wild guess.
We are seeing this problem since this bug has been fixed:
https://sogo.nu/bugs/view.php?id=4010

although this could also just be a coincidence.

Best,
Hp

I've pushed a tentative fix, try it.

same problem with the fix :(

More and more users calendars are affected

We just tried a new installation with sogo 2.3.21, PGSQL 9.6 & nginx 1.12 ... and import of our database .. problem : POPUP : Avertissement: An error occured while loading... but the calendars don't disappears
We are going to try a downgrade 2.3.20, this problem impacted the directors it is very embarrassing.

If the problem isn't in 2.3.20 but is in 2.3.21, it should be fairly simple to identify. We'll check today.

We are able to reproduce the issue. A fix is coming up.

good news