I configured what I thought were two identical FreeRadus 2.1.3 servers. I'm attempting to do MS-CHAP2 authentication on both, one is working, the other is not. For the life of me I can't find any difference in their configuration. On my client, I switch the host name between the two servers, everything else stays the same. One works, one fails, and I don't know why. Below is the debug output for both the failure and success. PAP authentication works fine on both with the same id. What the heck have I missed? This is the one that fails: rad_recv: Access-Request packet from host 192.168.2.15 port 2357, id=26, length=127 NAS-Identifier = "test-cam1" NAS-IP-Address = 192.168.2.15 MS-CHAP-Challenge = 0xbd4261d677c0d793ee781d7a032218df MS-CHAP2-Response = 0xa300ac9567587df3e83b3799dc49a53f433000000000000000007e0e6320a093349fbd0afc94436ed32e1258e26c5463147b User-Name = "test26" +- entering group authorize {...} ++[preprocess] returns ok ++[chap] returns noop [mschap] Found MS-CHAP attributes. Setting 'Auth-Type = mschap' ++[mschap] returns ok [suffix] No '@' in User-Name = "test26", looking up realm NULL [suffix] No such realm "NULL" ++[suffix] returns noop [eap] No EAP-Message, not doing EAP ++[eap] returns noop ++[unix] returns notfound [files] users: Matched entry DEFAULT at line 5 ++[files] returns ok ++[expiration] returns noop ++[logintime] returns noop [pap] WARNING! No "known good" password found for the user. Authentication may fail because of this. ++[pap] returns noop Found Auth-Type = MSCHAP +- entering group MS-CHAP {...} [mschap] No Cleartext-Password configured. Cannot create LM-Password. [mschap] No Cleartext-Password configured. Cannot create NT-Password. [mschap] Told to do MS-CHAPv2 for test26 with NT-Password [mschap] FAILED: No NT/LM-Password. Cannot perform authentication. [mschap] FAILED: MS-CHAP2-Response is incorrect ++[mschap] returns reject Failed to authenticate the user. Login incorrect: [test26] (from client 192.168.2.15 port 0) Using Post-Auth-Type Reject +- entering group REJECT {...} [attr_filter.access_reject] expand: %{User-Name} -> test26 attr_filter: Matched entry DEFAULT at line 11 ++[attr_filter.access_reject] returns updated Delaying reject of request 7 for 1 seconds Going to the next request Waking up in 0.9 seconds. Sending delayed reject for request 7 Sending Access-Reject of id 26 to 192.168.2.15 port 2357 Waking up in 4.9 seconds. Cleaning up request 7 ID 26 with timestamp +1885 Ready to process requests. This one works: rad_recv: Access-Request packet from host 192.168.2.15 port 2358, id=115, length=127 NAS-Identifier = "test-cam1" NAS-IP-Address = 192.168.2.15 MS-CHAP-Challenge = 0xfdd0ccd7059225f80093cea2929eb415 MS-CHAP2-Response = 0x780017ff811e7761fc6bd332fb45f4f6b3f50000000000000000b6834efb6626804caf2aa055c5a157851e9bc927698cf23f User-Name = "test26" +- entering group authorize {...} ++[preprocess] returns ok ++[chap] returns noop [mschap] Found MS-CHAP attributes. Setting 'Auth-Type = mschap' ++[mschap] returns ok [suffix] No '@' in User-Name = "test26", looking up realm NULL [suffix] No such realm "NULL" ++[suffix] returns noop [eap] No EAP-Message, not doing EAP ++[eap] returns noop ++[unix] returns notfound [files] users: Matched entry DEFAULT at line 5 ++[files] returns ok ++[expiration] returns noop ++[logintime] returns noop [pap] WARNING! No "known good" password found for the user. Authentication may fail because of this. ++[pap] returns noop Found Auth-Type = MSCHAP +- entering group MS-CHAP {...} [mschap] No Cleartext-Password configured. Cannot create LM-Password. [mschap] No Cleartext-Password configured. Cannot create NT-Password. [mschap] Told to do MS-CHAPv2 for test26 with NT-Password [mschap] expand: --username=%{mschap:User-Name:-None} -> --username=test26 [mschap] No NT-Domain was found in the User-Name. [mschap] expand: --domain=%{mschap:NT-Domain:-ap1} -> --domain=ap1 [mschap] mschap2: fd [mschap] expand: --challenge=%{mschap:Challenge:-00} -> --challenge=cc26ba941d6d9678 [mschap] expand: --nt-response=%{mschap:NT-Response:-00} -> --nt-response=b6834efb6626804caf2aa055c5a157851e9bc927698cf23f Exec-Program output: NT_KEY: D3D489B13ACA7C5E93887C212EFCCB0B Exec-Program-Wait: plaintext: NT_KEY: D3D489B13ACA7C5E93887C212EFCCB0B Exec-Program: returned: 0 ++[mschap] returns ok Login OK: [test26] (from client 192.168.2.15 port 0) +- entering group post-auth {...} ++[exec] returns noop Sending Access-Accept of id 115 to 192.168.2.15 port 2358 MS-CHAP2-Success = 0x78533d41453631324635393130344535373132364133414234374339463844443541453538384142453943 Finished request 5. Going to the next request Waking up in 4.9 seconds. Cleaning up request 5 ID 115 with timestamp +1773 Ready to process requests. -Mike