Condensed from here: https://support.google.com/a/answer/2589954?hl=en:
The above are all on port 443, HTTPS, only. There is a legacy product which uses talk.google.com on port 5222, XMPP.
Here are some tools:
http://support.atmail.com/display/A7DOCS/Outlook+CalDAV+Synchronization+Setup
If Google Chrome fails to load any web page, giving the “aw snap” after a few minutes, try adding this to the shortcut:
–-no-sandbox
Unfortunately this is not a fix, but a way to prove the problem — the problem is malware.
Add the following to all shortcuts, before the %U:
--disk-cache-size=1
and also add the above to this registry key:
HKEY_CLASSES_ROOT\ChromeHTML\shell\open\command
On lower-powered PCs, CPU not necessarily RAM, this can prevent Chrome from locking up the PC to do cache cleanup. And it does speed up Chrome a lot — in fact, as long as one has 2G RAM or so, this seems like a good idea in general.