I have also come across this error for the first time recently and would appreciate some clarification as to what it means?
The system events I saw in my log had extra info:
Code:
Feb 27 16:17:48 sbls saslauthd[14072]: zmauth: authenticating against elected url 'https://mail.XXXX.com:7071/service/admin/soap/' ...
Feb 27 16:17:49 mail saslauthd[14072]: zmauth: authenticating against elected url 'https://mail.XXXX.com:7071/service/admin/soap/' ...
Feb 27 16:17:49 sbls saslauthd[14072]: zmpost: url='https://mail.XXXX.com:7071/service/admin/soap/' returned buffer->data='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="309552"/></context></soap:Header><soap:Body><AuthResponse xmlns="urn:zimbraAccount"><authToken>0_089d3bea4fe359d94d54ab01a1c9a5bc7f0888a7_69643d33363a63663139323431622d343436642d346633302d393565342d3266353432616366333362613b6578703d31333a313239383935363636393236333b747970653d363a7a696d6272613b</authToken><lifetime>172800000</lifetime><skin>beach</skin></AuthResponse></soap:Body></soap:Envelope>', hti->error=''
Feb 27 16:17:49 sbls saslauthd[14072]: auth_zimbra: user_name at XXXX.com auth OK
Feb 27 16:17:49 mail saslauthd[14072]: zmpost: url='https://mail.XXXX.com:7071/service/admin/soap/' returned buffer->data='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="309552"/></context></soap:Header><soap:Body><AuthResponse xmlns="urn:zimbraAccount"><authToken>0_089d3bea4fe359d94d54ab01a1c9a5bc7f0888a7_69643d33363a63663139323431622d343436642d346633302d393565342d3266353432616366333362613b6578703d31333a313239383935363636393236333b747970653d363a7a696d6272613b</authToken><lifetime>172800000</lifetime><skin>beach</skin></AuthResponse></soap:Body></soap:Envelope>', hti->error=''
Feb 27 16:17:49 mail saslauthd[14072]: auth_zimbra: user_name at XXXX.com auth OK
Feb 27 16:50:27 sbls saslauthd[14073]: zmauth: authenticating against elected url 'https://mail.XXXX.com:7071/service/admin/soap/' ...
Feb 27 16:50:27 sbls saslauthd[14073]: zmpost: url='https://mail.XXXX.com:7071/service/admin/soap/' returned buffer->data='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="309554"/></context></soap:Header><soap:Body><AuthResponse xmlns="urn:zimbraAccount"><authToken>0_98745bd2b810e7412eeb1de5892184dce0d79820_69643d33363a63663139323431622d343436642d346633302d393565342d3266353432616366333362613b6578703d31333a313239383935383632373630383b747970653d363a7a696d6272613b</authToken><lifetime>172800000</lifetime><skin>beach</skin></AuthResponse></soap:Body></soap:Envelope>', hti->error=''
Feb 27 16:50:27 mail saslauthd[14073]: zmauth: authenticating against elected url 'https://mail.XXXX.com:7071/service/admin/soap/' ...
Feb 27 16:50:27 sbls saslauthd[14073]: auth_zimbra: user_name at XXXX.com auth OK
Feb 27 16:50:27 mail saslauthd[14073]: zmpost: url='https://mail.XXXX.com:7071/service/admin/soap/' returned buffer->data='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="309554"/></context></soap:Header><soap:Body><AuthResponse xmlns="urn:zimbraAccount"><authToken>0_98745bd2b810e7412eeb1de5892184dce0d79820_69643d33363a63663139323431622d343436642d346633302d393565342d3266353432616366333362613b6578703d31333a313239383935383632373630383b747970653d363a7a696d6272613b</authToken><lifetime>172800000</lifetime><skin>beach</skin></AuthResponse></soap:Body></soap:Envelope>', hti->error=''
Feb 27 16:50:27 mail saslauthd[14073]: auth_zimbra: user_name at XXXX.com auth OK
Feb 27 16:58:01 sbls saslauthd[14074]: zmauth: authenticating against elected url 'https://mail.XXXX.com:7071/service/admin/soap/' ...
Feb 27 16:58:01 sbls saslauthd[14074]: zmpost: url='https://mail.XXXX.com:7071/service/admin/soap/' returned buffer->data='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="309554"/></context></soap:Header><soap:Body><AuthResponse xmlns="urn:zimbraAccount"><authToken>0_6280d223fe7084349900fce68ec38fe56bb5e716_69643d33363a63663139323431622d343436642d346633302d393565342d3266353432616366333362613b6578703d31333a313239383935393038313835363b747970653d363a7a696d6272613b</authToken><lifetime>172800000</lifetime><skin>beach</skin></AuthResponse></soap:Body></soap:Envelope>', hti->error=''
Feb 27 16:58:01 mail saslauthd[14074]: zmauth: authenticating against elected url 'https://mail.XXXX.com:7071/service/admin/soap/' ...
Feb 27 16:58:02 sbls saslauthd[14074]: auth_zimbra: user_name at XXXX.com auth OK
Feb 27 16:58:02 mail saslauthd[14074]: zmpost: url='https://mail.XXXX.com:7071/service/admin/soap/' returned buffer->data='<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope"><soap:Header><context xmlns="urn:zimbra"><change token="309554"/></context></soap:Header><soap:Body><AuthResponse xmlns="urn:zimbraAccount"><authToken>0_6280d223fe7084349900fce68ec38fe56bb5e716_69643d33363a63663139323431622d343436642d346633302d393565342d3266353432616366333362613b6578703d31333a313239383935393038313835363b747970653d363a7a696d6272613b</authToken><lifetime>172800000</lifetime><skin>beach</skin></AuthResponse></soap:Body></soap:Envelope>', hti->error=''
Feb 27 16:58:02 mail saslauthd[14074]: auth_zimbra: user_name at XXXX.com auth OK