No, they also fail (they used to work fine before) with 'username or password is incorrect'. I can see the connection attempts logged in:
/var/log/apache2/service_proxy_access.log
/var/log/apache2/service_proxy_error.log
but I don't see anything that looks like an error in there.
Every time I try (and fail) to connect I see the following in opendirectoryd.log:
2015-09-27 09:07:37.766163 BST - AID: 0x0000000000000000 - 45934.1079368 - Client: httpd, UID: 70, EUID: 70, GID: 70, EGID: 70
2015-09-27 09:07:37.766163 BST - AID: 0x0000000000000000 - 45934.1079368, Node: /LDAPv3/127.0.0.1, Module: AppleODClientPWS - Parse error
2015-09-27 09:07:37.766187 BST - AID: 0x0000000000000000 - 45934.1079368 - Client: httpd, UID: 70, EUID: 70, GID: 70, EGID: 70
2015-09-27 09:07:37.766187 BST - AID: 0x0000000000000000 - 45934.1079368, Node: /LDAPv3/127.0.0.1, Module: AppleODClientPWS - could not continue SASL client session: generic failure (-1) (5103)
2015-09-27 09:07:37.777753 BST - AID: 0x0000000000000000 - 45934.1079373 - Client: httpd, UID: 70, EUID: 70, GID: 70, EGID: 70
2015-09-27 09:07:37.777753 BST - AID: 0x0000000000000000 - 45934.1079373, Node: /LDAPv3/127.0.0.1, Module: AppleODClientPWS - Parse error
2015-09-27 09:07:37.777773 BST - AID: 0x0000000000000000 - 45934.1079373 - Client: httpd, UID: 70, EUID: 70, GID: 70, EGID: 70
2015-09-27 09:07:37.777773 BST - AID: 0x0000000000000000 - 45934.1079373, Node: /LDAPv3/127.0.0.1, Module: AppleODClientPWS - could not continue SASL client session: generic failure (-1) (5103)
Which looks suspicious. But these same (OD) users are working fine for Mail, Calendar, Contacts, SMB, AFP and even authenticated website access.
I hope that Apple takes notice of this ASAP.