ICS file could not be retrieved

It’s possible that the URL you’re using is returning a 301 or 302 redirect. Browsers will handle this seamlessly and maybe wget does as well, but the plugin (and presumably cURL) won’t actually follow the redirect. I’ll look into this a bit more but if you can determine whether or not there’s a redirect, let me know. (I can test it later but I wanted to get you a quick response in case you’re actively working on this right now.)

It looks like this with wget:

env LANG=en wget -dO – “https://www.mytischtennis.de/community/exportICSCalendar?teamids=2257207”

Setting –output-document (outputdocument) to –
DEBUG output created by Wget 1.19.1 on cygwin.

Reading HSTS entries from /home/Gerro/.wget-hsts
URI encoding = ‘ANSI_X3.4-1968’
converted ‘https://www.mytischtennis.de/community/exportICSCalendar?teamids=2257207’ (ANSI_X3.4-1968) -> ‘https://www.mytischtennis.de/community/exportICSCalendar?teamids=2257207’ (UTF-8)
–2020-02-15 20:40:38– https://www.mytischtennis.de/community/exportICSCalendar?teamids=2257207
Certificates loaded: 149
Resolving https://www.mytischtennis.de (www.mytischtennis.de)… 193.26.98.105
Caching https://www.mytischtennis.de => 193.26.98.105
Connecting to https://www.mytischtennis.de (www.mytischtennis.de)|193.26.98.105|:443… connected.
Created socket 3.
Releasing 0x00000006004d2e30 (new refcount 1).

—request begin—
GET /community/exportICSCalendar?teamids=2257207 HTTP/1.1
User-Agent: Wget/1.19.1 (cygwin)
Accept: */*
Accept-Encoding: identity
Host: https://www.mytischtennis.de
Connection: Keep-Alive

—request end—
HTTP request sent, awaiting response…
—response begin—
HTTP/1.1 200 OK
Set-Cookie: cfid=4387c644-65b3-454b-9d88-9e6946cd0b12;Path=/;Expires=Fri, 06-Mar-2020 21:18:48 UTC;HTTPOnly
Set-Cookie: cftoken=0;Path=/;Expires=Fri, 06-Mar-2020 21:18:48 UTC;HTTPOnly
Content-Disposition: inline; filename=mytischtennis_de_kalender_export_2020-02-15.ics
Content-Type: text/calendar;charset=UTF-8
Content-Length: 5100
Date: Sat, 15 Feb 2020 19:40:43 GMT
Server: Microsoft-IIS/7.5
X-Varnish: 92256979
Age: 0
Via: 1.1 varnish-v4
X-Cache: Miss
Accept-Ranges: bytes
Connection: close
Set-Cookie: SRV=82; path=/

—response end—
200 OK

Stored cookie https://www.mytischtennis.de -1 (ANY) / <session> <insecure> [expiry none] cfid 4387c644-65b3-454b-9d88-9e6946cd0b12

Stored cookie https://www.mytischtennis.de -1 (ANY) / <session> <insecure> [expiry none] cftoken 0

Stored cookie https://www.mytischtennis.de -1 (ANY) / <session> <insecure> [expiry none] SRV 82
URI content encoding = ‘UTF-8’
Length: 5100 (5.0K) [text/calendar]
Saving to: ‘STDOUT’
BEGIN:VCALENDAR
METHOD:PUBLISH
PRODID:-//Mozilla.org/NONSGML Mozilla Calendar V1.1//EN
VERSION:2.0
X-WR-CALNAME:Termine von TuS Et. Wiesbaden 1846
BEGIN:VEVENT
SUMMARY:TSG Niederhofheim 06 vs. TuS Et. Wiesbaden 1846
DTSTART;TZID=Europe/Berlin:20190906T181500
DTEND;TZID=Europe/Berlin:20190906T211500
LOCATION:Schulturnhalle Wachenheimer Stra?e 67 65835 Liederbach
DESCRIPTION:Vorrunde
TRANSP:TRANSPARENT
UID:6644FDBF4090B18B262B80F2AB45A0A5
END:VEVENT
[…]
END:VCALENDAR
-end-

0K …. 100% 171M=0s

2020-02-15 20:40:38 (171 MB/s) – written to stdout [5100/5100]

With curl i just never get the file. The response always just sends 200-OK, the header Content-Disposition and a session cookie. I already tried to find out, if the session cookies causes this, or if it is that header and just found out that wget handles both quietly.

With curl:

curl -IL “https://www.mytischtennis.de/community/exportICSCalendar?teamids=2257207&#8221;
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 –:–:– –:–:– –:–:– 0
HTTP/1.1 200 OK
Set-Cookie: cfid=f9c65d0f-be83-4e0a-892a-a953318ce3b2;Path=/;Expires=Fri, 06-Mar-2020 21:30:02 UTC;HTTPOnly
Set-Cookie: cftoken=0;Path=/;Expires=Fri, 06-Mar-2020 21:30:02 UTC;HTTPOnly
Content-Disposition: inline; filename=mytischtennis_de_kalender_export_2020-02-15.ics
Content-Type: text/calendar;charset=UTF-8
Date: Sat, 15 Feb 2020 19:51:58 GMT
Server: Microsoft-IIS/7.5
X-Varnish: 150420197
Age: 0
Via: 1.1 varnish-v4
X-Cache: Miss
Accept-Ranges: bytes
Connection: close
Set-Cookie: SRV=81; path=/

• This reply was modified 5 years, 1 month ago by gerroden.
• This reply was modified 5 years, 1 month ago by Steven Stern (sterndata).

I have a similar Problem, tried to curl it from the server and got the file, no issue there but from inside the plugin i hear:

SSL operation failed with code 1. OpenSSL Error messages:
error:1416F086:SSL routines:tls_process_server_certificate:certificate verify failed in /.../wp-content/plugins/ics-calendar/functions.php on line 390

then it sais failed to enable crypto and failed to open stream

not sure if this is related but i get this from google calendar as well as several nextcloud calendars

If you’re able to SSH into your web server and successfully retrieve the feed using cURL, then the issue is most likely something in your PHP configuration. First I would make sure to update everything on the web server, if possible, including (especially) PHP, cURL and OpenSSL. Then you may need to check your PHP configuration.

One other thing —?be sure that the SSL certificate on your feed server has not expired; it’s possible that you were running cURL with flags to bypass peer verification.

Beyond that you may just need to search on that OpenSSL error and see if you find anything helpful, such as this:

https://stackoverflow.com/questions/46511717/how-to-fix-ssl-certificate-verification-failure