Servers still online?

Perhaps a temporary error. I played with friends yesterday. If it persists, I'd verify game files through Origin (may mess with mods).

I have the problem solved - I thought I did answer to that one.

I ran the repair tool in Origin, which did disable my UI scaling mod, but the multiplayer worked. With that the UI was so small that it was too hard (if not outright impossible) to see anything on my 27" 4k (3840x2160) screen, so I lowered the resolution to 2560x1440 and took the degradation of quality that you reap when you use your monitor in a non-native mode into account. It still looks pretty enough to be perfectly playable.

As for the point ratings: Well on my first playthrough, which was before anything about the ending was patched, I got a very bad variation of the control ending, if not the worst variation thereof. The DLCs simply did not exist at the time and I was unable to make piece between quarians and geth. (Even though I made every choice in game just right to make peace, one needed 80% paragon score and I had only about 78%. Had I done any unrelated mission first, of which there were a few, I would have been able to make peace, but I could not know this at the time.) Consequently, even though I completed everything, I had considerably less points on my account and I hadn't realised that you need to play multiplayer to get rid of this galactic readiness penalty. It contributed to the relatively bad ending that I important a real unbiased play-through, in which Garrus, Mordin and Jack were already dead, which means there were other points that you could not earn in the game. I don't recall exactly what my effective military strength was, only that it was more than 2500 and less than 2800 at a readiness rating of 50%, i.e. the total military strength would have been above 5k, but less than 6k.

I made a screen shot of the score table in the game I finished yesterday, after the assault on the Cerberus base but before the assault on earth (at which point you are already committed to the ending, without the points on the Cerberus base, before I was committed to the ending it would have been roughly 100 points less). 8077 total military strenght, 100% galactic readiness, 8077 effective military strength. I don't know whether I could have gotten the best ending even without that - I would have had 4039 points - but it doesn't sound like that would have been enough. Under no circumstance did I want to see earth destroyed again. 8077 points isn't perfect, there were a few points that I left on the road here and there, I had to squeeze out everything that I could.

Well, you need at least 80% paragon score to make peace between quarians and geth, or at least that was the case at the time I played it. In my original play-through I could see the option, I coincidentally made all the decision just right to save the day, but having made the right decisions was not good enough, the option was greyed out - I checked that later, after I finished the game. I never punched a quarian general, for example. If you do not save make peace between quarians and geth, you would loose the war assets that the faction that you wiped out might have provided.