My apologies for being so late in replying.
Well frankly I'm stumped. I searched the Google Chrome forums for "Oops! Google Chrome could not connect to mail.aol.com:81" and found a couple of posts, but in neither was there a response.
Have a read of http://www.webtlk.com/2011/02/08/how-to-solve-google-chrome-cant-access-email-accounts/ and see if there is anything that helps.
If not I wonder if this is a certification issue between Chrome and AOL. In Chrome Settings then Advanced Settings, find HTTPS/SSL and click the "Managing Certificates" button. SSL is often used with email servers.
In the new window click the "Trusted Root Certification Authorities" tab. I can see a certificate there for America Online Root, (I had to drag the column header to the right to see it all), and this expires on May 30 2020. What does yours show?
Other than that I have no further ideas. At least you can still access AOLMail on your other browsers.