Same here. Just started 30 minutes ago after a reboot caused by yet another in the regular deluge of Acrobat Reader update installs. What do I do? I added a bookmark this morning, so I have no idea if that synced to my other PC.

         63.245.217.207

same thing, started today. i have pasted my sync-log here. my username has been changed from my real username to "username". i noticed the URL in the log. nslookup returns Non-authoritative answer: Name: sync-rr.phx.services.mozilla.com Addresses: 63.245.217.208 63.245.217.207 Aliases: phx-sync038.services.mozilla.com and i am able to surf to the page. it asks me for a username and password, in which i put my sync username & password. it seems to take the login/pass just fine but no page is served - it just sits on loading forever. 1309215660360 Service.Main INFO Loading Weave 1.8.0 1309215660371 Engine.Bookmarks DEBUG Engine initialized 1309215660372 Engine.Forms DEBUG Engine initialized 1309215660374 Engine.History DEBUG Engine initialized 1309215660375 Engine.Passwords DEBUG Engine initialized 1309215660376 Engine.Prefs DEBUG Engine initialized 1309215660377 Engine.Tabs DEBUG Engine initialized 1309215660378 Engine.Tabs DEBUG Resetting tabs last sync time 1309215660379 Service.Main INFO Mozilla/5.0 (Windows NT 6.1; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0 1309215660382 Service.Main DEBUG Caching URLs under storage user base: https://phx-sync038.services.mozilla.com/1.1/username/ 1309215660384 Service.Main INFO Starting sync at 2011-06-27 18:01:00 1309215660384 Service.Main DEBUG In sync: should login. 1309215660386 Service.Main INFO Logging in user username 1309215661024 Net.Resource DEBUG mesg: GET fail 503 https://phx-sync038.services.mozilla.com/1.1/username/info/collections 1309215661025 Net.Resource DEBUG GET fail 503 https://phx-sync038.services.mozilla.com/1.1/username/info/collections 1309215661033 Service.Main DEBUG Exception: Login failed: error.login.reason.server No traceback available 1309215661034 Service.Main DEBUG Not syncing: login returned false. 1309215661035 Service.Main DEBUG Clearing sync triggers. 1309215664700 Service.Main INFO Logging in user username 1309215664796 Net.Resource DEBUG mesg: GET fail 503 https://phx-sync038.services.mozilla.com/1.1/username/info/collections 1309215664797 Net.Resource DEBUG GET fail 503 https://phx-sync038.services.mozilla.com/1.1/username/info/collections 1309215664801 Service.Main DEBUG Exception: Login failed: error.login.reason.server No traceback available 1309215664802 Service.Main DEBUG Autoconnect failed: error.login.reason.server; retry in 89 sec. 1309215699971 Service.Main DEBUG Clearing sync triggers. 1309215704491 Service.Main INFO Starting sync at 2011-06-27 18:01:44 1309215704492 Service.Main DEBUG In sync: should login. 1309215704494 Service.Main INFO Logging in user username 1309215704839 Net.Resource DEBUG mesg: GET fail 503 https://phx-sync038.services.mozilla.com/1.1/username/info/collections 1309215704840 Net.Resource DEBUG GET fail 503 https://phx-sync038.services.mozilla.com/1.1/username/info/collections 1309215704844 Service.Main DEBUG Exception: Login failed: error.login.reason.server No traceback available 1309215704845 Service.Main DEBUG Not syncing: login returned false. 1309215704846 Service.Main DEBUG Clearing sync triggers.

I started to get this message also. Across all my devices