Constant Failed Attempts from ASYNC ports

Our ACS 4.2 Failed Attempts log is being filled by "noise" on the async (tty0/tty1) from both our routers and switches. We have modems attached to our routers primarily on the console ports, in addition we have the aux port of our router connected to the console port of our LAN switch so we can reverse telnet into the switch. Both router & switch are TACACs enabled. In the user-name field of the ACS log, we get "noise" such as "interface up and down", "Press RETURN to get started", which the authen-failure-code indicates invalid characters or "ACS user unknown" in username field. What would cause this?  I know misconfigured modems can cause echo issues but why a switch console port?

Dan/Greg,
This issue occurs when terminal server device (like c2509, c2511 or other) connect to it and which is sending junk to console or aux lines of the Router/Switch.
What may happen wrong with Terminal Server config:
= Incorrect speed for the line (which is connected to console of the router)
= possibly "exec" is running on that line on Terminal Server, thus sending unexpected prompt to the router console/aux.
When you want to allow only an outgoing connection on a line, use the *no**exec* command.The *no exec* command allows you to disable the EXEC process for connections which may attempt to send unsolicited data to the router.
(For example, the control port of a rack of modems attached to an auxiliary port of router.) When certain types of data are sent to a line connection, an EXEC process can start, which makes the line unavailable.
The user will still be able to access the console of the device and be authenticated as well.  This puts extra burden on ACS and you may see some latency with legitimate authentications.  
Let me know if you have any question.
Regards,
~JG
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                (CN=2f0b8ac0-2630-441a-891f-b5fcb91498a8,CN=Partitions,CN=Configuration,DC=domain,DC=school,DC=edu)
                 information: 
                   LDAP Error 0x52e (1326). 
             ......................... DomainDnsZones failed test CheckSDRefDom
          Starting test: CrossRefValidation
                For the partition
                (DC=DomainDnsZones,DC=domain,DC=school,DC=edu) we encountered
                the following error retrieving the cross-ref's
                (CN=2f0b8ac0-2630-441a-891f-b5fcb91498a8,CN=Partitions,CN=Configuration,DC=domain,DC=school,DC=edu)
                 information: 
                   LDAP Error 0x52e (1326). 
             ......................... DomainDnsZones failed test
             CrossRefValidation
       Running partition tests on : Schema
          Starting test: CheckSDRefDom
             ......................... Schema passed test CheckSDRefDom
          Starting test: CrossRefValidation
                For the partition
                (CN=Schema,CN=Configuration,DC=domain,DC=school,DC=edu) we
                encountered the following error retrieving the cross-ref's
                (CN=Enterprise Schema,CN=Partitions,CN=Configuration,DC=domain,DC=school,DC=edu)
                 information: 
                   LDAP Error 0x52e (1326). 
             ......................... Schema failed test CrossRefValidation
       Running partition tests on : Configuration
          Starting test: CheckSDRefDom
             ......................... Configuration passed test CheckSDRefDom
          Starting test: CrossRefValidation
                For the partition
                (CN=Configuration,DC=domain,DC=school,DC=edu) we encountered
                the following error retrieving the cross-ref's
                (CN=Enterprise Configuration,CN=Partitions,CN=Configuration,DC=domain,DC=school,DC=edu)
                 information: 
                   LDAP Error 0x52e (1326). 
             ......................... Configuration failed test CrossRefValidation
       Running partition tests on : domain
          Starting test: CheckSDRefDom
             ......................... domain passed test CheckSDRefDom
          Starting test: CrossRefValidation
                For the partition (DC=domain,DC=school,DC=edu) we encountered
                the following error retrieving the cross-ref's
                (CN=domain,CN=Partitions,CN=Configuration,DC=domain,DC=school,DC=edu)
                 information: 
                   LDAP Error 0x52e (1326). 
             ......................... domain failed test CrossRefValidation
       Running enterprise tests on : domain.school.edu
          Starting test: LocatorCheck
             ......................... domain.school.edu passed test
             LocatorCheck
          Starting test: Intersite
             ......................... domain.school.edu passed test Intersite
    From what I can gather, there is a definite DNS issue but I don't have any stale records to the old DC stored anywhere. I've tried this with a new server as well and get similar errors... 
    At this rate I'm ready to rebuild the entire forest over again. I'm just reluctant to do so as I want to make this a learning experience for the students. 
    Any help would be greatly appreciated. Thanks!

    As you can see, there seems to be some errors. The one that I did correct was the one around the _msdcs NS record being unable to resolve. For whatever, reason the name wasn't resolving the IP but all other NS tabs and records were. Just that one _msdcs
    sub-zone. Furthermore, the mentioning of any connections to root hint servers can be viewed as false positives. There is no external comms to this lab so no communication with outside IPs can be expected. Lastly, they mentioned a connectivity issue yet mention
    that I should check the firewall settings. All three profiles are disabled in Windows Firewall (as they have been the entire time). Thank you in advance for your help!
    C:\Windows\system32>dcdiag /test:dns /v
    Directory Server Diagnosis
    Performing initial setup:
       Trying to find home server...
       * Verifying that the local machine domainVMDC2, is a Directory Server.
       Home Server = domainVMDC2
       * Connecting to directory service on server domainVMDC2.
       * Identified AD Forest.
       Collecting AD specific global data
       * Collecting site info.
       Calling ldap_search_init_page(hld,CN=Sites,CN=Configuration,DC=domain,DC=school,DC=edu,LDAP_SCOPE_SUBTREE,(objectCategory=ntDSSiteSettings),.......
       The previous call succeeded
       Iterating through the sites
       Looking at base site object: CN=NTDS Site Settings,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=domain,DC=school,DC=edu
       Getting ISTG and options for the site
       * Identifying all servers.
       Calling ldap_search_init_page(hld,CN=Sites,CN=Configuration,DC=domain,DC=school,DC=edu,LDAP_SCOPE_SUBTREE,(objectClass=ntDSDsa),.......
       The previous call succeeded....
       The previous call succeeded
       Iterating through the list of servers
       Getting information for the server CN=NTDS Settings,CN=domainVMDC2,CN=Servers,CN=Default-First-Site-Name,CN=Sites,CN=Configuration,DC=domain,DC=school,DC=edu
       objectGuid obtained
       InvocationID obtained
       dnsHostname obtained
       site info obtained
       All the info for the server collected
       * Identifying all NC cross-refs.
       * Found 1 DC(s). Testing 1 of them.
       Done gathering initial info.
    Doing initial required tests
       Testing server: Default-First-Site-Name\domainVMDC2
          Starting test: Connectivity
             * Active Directory LDAP Services Check
             The host
             3a38b19c-4bb3-4542-acb6-9e5e97cc15c4._msdcs.domain.school.edu
             could not be resolved to an IP address. Check the DNS server, DHCP,
             server name, etc.
             Got error while checking LDAP and RPC connectivity. Please check your
             firewall settings.
             ......................... domainVMDC2 failed test Connectivity
    Doing primary tests
       Testing server: Default-First-Site-Name\domainVMDC2
          Test omitted by user request: Advertising
          Test omitted by user request: CheckSecurityError
          Test omitted by user request: CutoffServers
          Test omitted by user request: FrsEvent
          Test omitted by user request: DFSREvent
          Test omitted by user request: SysVolCheck
          Test omitted by user request: KccEvent
          Test omitted by user request: KnowsOfRoleHolders
          Test omitted by user request: MachineAccount
          Test omitted by user request: NCSecDesc
          Test omitted by user request: NetLogons
          Test omitted by user request: ObjectsReplicated
          Test omitted by user request: OutboundSecureChannels
          Test omitted by user request: Replications
          Test omitted by user request: RidManager
          Test omitted by user request: Services
          Test omitted by user request: SystemLog
          Test omitted by user request: Topology
          Test omitted by user request: VerifyEnterpriseReferences
          Test omitted by user request: VerifyReferences
          Test omitted by user request: VerifyReplicas
          Starting test: DNS
             DNS Tests are running and not hung. Please wait a few minutes...
             See DNS test in enterprise tests section for results
             ......................... domainVMDC2 passed test DNS
       Running partition tests on : ForestDnsZones
          Test omitted by user request: CheckSDRefDom
          Test omitted by user request: CrossRefValidation
       Running partition tests on : DomainDnsZones
          Test omitted by user request: CheckSDRefDom
          Test omitted by user request: CrossRefValidation
       Running partition tests on : Schema
          Test omitted by user request: CheckSDRefDom
          Test omitted by user request: CrossRefValidation
       Running partition tests on : Configuration
          Test omitted by user request: CheckSDRefDom
          Test omitted by user request: CrossRefValidation
       Running partition tests on : domain
          Test omitted by user request: CheckSDRefDom
          Test omitted by user request: CrossRefValidation
       Running enterprise tests on : domain.school.edu
          Starting test: DNS
             Test results for domain controllers:
                DC: domainVMDC2
                Domain: domain.school.edu
                   TEST: Authentication (Auth)
                      Authentication test: Successfully completed
                   TEST: Basic (Basc)
                      Error: No LDAP connectivity
                      The OS
                      Microsoft Windows Server 2012 R2 Datacenter (Service Pack level: 0.0)
                      is supported.
                      NETLOGON service is running
                      kdc service is running
                      DNSCACHE service is running
                      DNS service is running
                      DC is a DNS server
                      Network adapters information:
                      Adapter [00000010] vmxnet3 Ethernet Adapter:
                         MAC address is 00:50:56:A2:2C:24
                         IP Address is static
                         IP address: *.*.100.26
                         DNS servers:
                            *.*.100.26 (domainVMDC2) [Valid]
                      No host records (A or AAAA) were found for this DC
                      The SOA record for the Active Directory zone was found
                      The Active Directory zone on this DC/DNS server was found primary
                      Root zone on this DC/DNS server was not found
                   TEST: Forwarders/Root hints (Forw)
                      Recursion is enabled
                      Forwarders are not configured on this DNS server
                      Root hint Information:
                         Name: a.root-servers.net. IP: 198.41.0.4 [Invalid (unreachable)]
                         Name: b.root-servers.net. IP: 192.228.79.201 [Invalid (unreachable)]
                         Name: c.root-servers.net. IP: 192.33.4.12 [Invalid (unreachable)]
                         Name: d.root-servers.net. IP: 199.7.91.13 [Invalid (unreachable)]
                         Name: e.root-servers.net. IP: 192.203.230.10 [Invalid (unreachable)]
                         Name: f.root-servers.net. IP: 192.5.5.241 [Invalid (unreachable)]
                         Name: g.root-servers.net. IP: 192.112.36.4 [Invalid (unreachable)]
                         Name: h.root-servers.net. IP: 128.63.2.53 [Invalid (unreachable)]
                         Name: i.root-servers.net. IP: 192.36.148.17 [Invalid (unreachable)]
                         Name: j.root-servers.net. IP: 192.58.128.30 [Invalid (unreachable)]
                         Name: k.root-servers.net. IP: 193.0.14.129 [Invalid (unreachable)]
                         Name: l.root-servers.net. IP: 199.7.83.42 [Invalid (unreachable)]
                         Name: m.root-servers.net. IP: 202.12.27.33 [Invalid (unreachable)]
                      Error: Both root hints and forwarders are not configured or
                      broken. Please make sure at least one of them works.
                   TEST: Delegations (Del)
                      Delegation information for the zone: domain.school.edu.
                         Delegated domain name: _msdcs.domain.school.edu.
                            Error: DNS server: domainvmdc2. IP:<Unavailable>
                            [Missing glue A record]
                            [Error details: 9714 (Type: Win32 - Description: DNS name does not exist.)]
                   TEST: Dynamic update (Dyn)
                      Test record dcdiag-test-record added successfully in zone domain.school.edu
                      Warning: Failed to delete the test record dcdiag-test-record in zone domain.school.edu
                      [Error details: 13 (Type: Win32 - Description: The data is invalid.)]
                   TEST: Records registration (RReg)
                      Network Adapter [00000010] vmxnet3 Ethernet Adapter:
                         Matching CNAME record found at DNS server *.*.100.26:
                         3a38b19c-4bb3-4542-acb6-9e5e97cc15c4._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.a9241004-88ea-422d-a71e-df7b622f0d68.domains._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _kerberos._tcp.dc._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.dc._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _kerberos._tcp.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _kerberos._udp.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _kpasswd._tcp.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.Default-First-Site-Name._sites.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _kerberos._tcp.Default-First-Site-Name._sites.dc._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.Default-First-Site-Name._sites.dc._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _kerberos._tcp.Default-First-Site-Name._sites.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.gc._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _gc._tcp.Default-First-Site-Name._sites.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.Default-First-Site-Name._sites.gc._msdcs.domain.school.edu
                         Matching  SRV record found at DNS server *.*.100.26:
                         _ldap._tcp.pdc._msdcs.domain.school.edu
                   Error: Record registrations cannot be found for all the network
                   adapters
             Summary of test results for DNS servers used by the above domain
             controllers:
                DNS server: 128.63.2.53 (h.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 128.63.2.53               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 192.112.36.4 (g.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.112.36.4               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 192.203.230.10 (e.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.203.230.10               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 192.228.79.201 (b.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.228.79.201               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 192.33.4.12 (c.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.33.4.12               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 192.36.148.17 (i.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.36.148.17               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 192.5.5.241 (f.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.5.5.241               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 192.58.128.30 (j.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 192.58.128.30               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 193.0.14.129 (k.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 193.0.14.129               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 198.41.0.4 (a.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 198.41.0.4               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 199.7.83.42 (l.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 199.7.83.42               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 199.7.91.13 (d.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 199.7.91.13               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: 202.12.27.33 (m.root-servers.net.)
                   1 test failure on this DNS server
                   PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DNS server 202.12.27.33               
    [Error details: 1460 (Type: Win32 - Description: This operation returned because the timeout period expired.)]
                DNS server: *.*.100.26 (domainVMDC2)
                   All tests passed on this DNS server
                   Name resolution is functional._ldap._tcp SRV record for the forest root domain is registered
             Summary of DNS test results:
                                                Auth Basc Forw Del  Dyn  RReg Ext
                Domain: domain.school.edu
                   domainVMDC2                 PASS FAIL FAIL FAIL WARN FAIL n/a
             ......................... domain.school.edu failed test DNS
          Test omitted by user request: LocatorCheck
          Test omitted by user request: Intersite

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