I'm still using Selfoss 2.9, perhaps the following was already fixed in 2.10?:

Every now and then the "Heise - Haupseite" feed kills the update process and no other feeds are downloaded anymore. Today it happened again after many months of flawless operation and I got the following error message in the web browser when running the Update process manually:

500 Internal Server Error - file_get_contents(http://www.heise.de/newsticker/meldung/Piraten-schliessen-sich-Klage-gegen-NSA-Ueberwachung-an-2151597.html/from/atom10?wt_mc=rss.ho.beitrag.atom): failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found

I then checked the heise 7-day feed and indeed there is this link to the full text article embedded and it leads to a 404 in the browser as well.

The reason for this is that heise has changed the title of the post and also the link on the web page while the title and link in the RSS feed has remained as it is.

The wrong link from the feed:
http://www.heise.de/newsticker/meldung/Piraten-schliessen-sich-Klage-gegen-NSA-Ueberwachung-an-2151597.html/from/atom10?wt_mc=rss.ho.beitrag.atom

The new link from the web page:
http://www.heise.de/newsticker/meldung/Piratenpartei-schliesst-sich-Klage-gegen-NSA-Ueberwachung-an-2151389.html

(note the different title and post id...)

I guess this max a fix for the issue (e.g. just ignoring that post in the feed) quite straight forward.

Cheers,
Martin