diff --git a/doc/assets-attribution.md b/doc/assets-attribution.md
index d42be8fb24..61b457a282 100644
--- a/doc/assets-attribution.md
+++ b/doc/assets-attribution.md
@@ -78,13 +78,13 @@ Everaldo (Everaldo Coelho)
 ### Assets Used
 	scripts/img/reload.xcf (modified), src/qt/res/movies/*.png
 
-[Vignoni David](http://www.oxygen-icons.org)
+[Vignoni David](http://techbase.kde.org/Projects/Oxygen)
 -----------------------
 
 ### Info
 * Designer: Vignoni David
 * License: Oxygen icon theme is dual licensed. You may copy it under the Creative Common Attribution-ShareAlike 3.0 License or the GNU Library General Public License.
-* Site: [http://www.oxygen-icons.org](http://www.oxygen-icons.org)
+* Site: [http://techbase.kde.org/Projects/Oxygen](http://techbase.kde.org/Projects/Oxygen)
 
 ### Assets Used
 	src/qt/res/icons/debugwindow.png
diff --git a/doc/translation_process.md b/doc/translation_process.md
index 9fb7622868..4b7b19f82f 100644
--- a/doc/translation_process.md
+++ b/doc/translation_process.md
@@ -70,7 +70,7 @@ We are using https://transifex.com as a frontend for translating the client.
 
 https://www.transifex.com/projects/p/bitcoin/resource/tx/
 
-The "Transifex client" (see: http://help.transifex.com/features/client/)
+The "Transifex client" (see: http://support.transifex.com/customer/portal/topics/440187-transifex-client/articles)
 will help with fetching new translations from Transifex. Use the following
 config to be able to connect with the client:
 
diff --git a/src/keystore.h b/src/keystore.h
index 0d55e6c81e..79d8661aca 100644
--- a/src/keystore.h
+++ b/src/keystore.h
@@ -32,7 +32,7 @@ public:
     virtual void GetKeys(std::set<CKeyID> &setAddress) const =0;
     virtual bool GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const;
 
-    // Support for BIP 0013 : see https://en.bitcoin.it/wiki/BIP_0013
+    // Support for BIP 0013 : see https://github.com/bitcoin/bips/blob/master/bip-0013.mediawiki
     virtual bool AddCScript(const CScript& redeemScript) =0;
     virtual bool HaveCScript(const CScriptID &hash) const =0;
     virtual bool GetCScript(const CScriptID &hash, CScript& redeemScriptOut) const =0;
diff --git a/src/rpcprotocol.cpp b/src/rpcprotocol.cpp
index 13028fdc77..652b14d187 100644
--- a/src/rpcprotocol.cpp
+++ b/src/rpcprotocol.cpp
@@ -221,7 +221,7 @@ int ReadHTTPMessage(std::basic_istream<char>& stream, map<string,
 // unspecified (HTTP errors and contents of 'error').
 //
 // 1.0 spec: http://json-rpc.org/wiki/specification
-// 1.2 spec: http://groups.google.com/group/json-rpc/web/json-rpc-over-http
+// 1.2 spec: http://jsonrpc.org/historical/json-rpc-over-http.html
 // http://www.codeproject.com/KB/recipes/JSON_Spirit.aspx
 //
 
diff --git a/src/test/bignum_tests.cpp b/src/test/bignum_tests.cpp
index 6587389a07..d5ee8c9778 100644
--- a/src/test/bignum_tests.cpp
+++ b/src/test/bignum_tests.cpp
@@ -39,11 +39,8 @@ BOOST_AUTO_TEST_SUITE(bignum_tests)
 // stack buffer overruns.
 //
 // For more accurate diagnostics, you can use an undefined arithmetic operation
-// detector such as the clang-based tool:
-//
-// "IOC: An Integer Overflow Checker for C/C++"
-//
-// Available at: http://embed.cs.utah.edu/ioc/
+// detector such as the clang's undefined behaviour checker.
+// See also: http://clang.llvm.org/docs/UsersManual.html#controlling-code-generation
 //
 // It might also be useful to use Google's AddressSanitizer to detect
 // stack buffer overruns, which valgrind can't currently detect.
diff --git a/src/test/netbase_tests.cpp b/src/test/netbase_tests.cpp
index 7d38700736..4321852d11 100644
--- a/src/test/netbase_tests.cpp
+++ b/src/test/netbase_tests.cpp
@@ -93,7 +93,7 @@ BOOST_AUTO_TEST_CASE(netbase_lookupnumeric)
 
 BOOST_AUTO_TEST_CASE(onioncat_test)
 {
-    // values from http://www.cypherpunk.at/onioncat/wiki/OnionCat
+    // values from https://web.archive.org/web/20121122003543/http://www.cypherpunk.at/onioncat/wiki/OnionCat
     CNetAddr addr1("5wyqrzbvrdsumnok.onion");
     CNetAddr addr2("FD87:D87E:EB43:edb1:8e4:3588:e546:35ca");
     BOOST_CHECK(addr1 == addr2);